Across
Liquid food originally consumed on river at Amiens (8)
Practical joker hiding small gemstone (6)
I haven't cracked this one yet — but Times for the Times have:
S in JAPER
Member of royal family embracing love endlessly in field? (8)
How is domination showing sound judgement? (6)
Stop say leaving Hebridean island (5)
I haven't cracked this one yet — but Times for the Times have:
COLONsay
Irish Protestant's rank in Arabian sultanate (9)
Passion for dance born unexpectedly in a male alto (12)
I haven't cracked this one yet — but Times for the Times have:
B (born) anagram* of IN A MALE ALTO
Violent robber faced with affectionate type's confusion (6-6)
Lightweight fabric: part of army issue, it's said (9)
Graze, except around entrance to holding (5)
I haven't cracked this one yet — but Times for the Times have:
H~ in SAVE (except, as in ‘All came save Richie – extraordinary that’)
Take in, as a joke, so to speak (6)
Attractive porcelain introduced by daily (8)
String-player's catalogue, including youthful recordings to begin with (6)
I haven't cracked this one yet — but Times for the Times have:
Y~ R~ (initial letters of words 5 & 6) in LIST (catalogue)
Dowdy char, possibly, possessing strange power (8)
I haven't cracked this one yet — but Times for the Times have:
RUM (strange) P (power) in FISH (char, possibly); only a pedant would call a woman frumpish, no? Incidentally, I’ve never heard/seen either used to describe a man, though I’ve heard women use it of other women. From the Dutch word meaning ‘wrinkled’ originally.
Down
Male bird swallowing extremely primitive Russian coin (6)
I haven't cracked this one yet — but Times for the Times have:
P~E in COCK
New dog failing to start pasta strip (6)
I haven't cracked this one yet — but Times for the Times have:
N pOODLE
Determine position of old gallery containing nothing from France (9)
I haven't cracked this one yet — but Times for the Times have:
RIEN (non, je ne regret rien…) in O TATE
Odd crime, to claim localised atmospheric conditions (12)
Copying narrow brooch in silver case (5)
Bar ignores the writer's feature on building (8)
I haven't cracked this one yet — but Times for the Times have:
imPEDIMENT – ‘the writer’, as so often, equates to I’M
Italian home entertaining a native of Bucharest, perhaps (8)
Map-maker and former president in possession of round plot (12)
I haven't cracked this one yet — but Times for the Times have:
O GRAPH in CARTER (peanut farmer turned POTUS, famous for the words ‘I believe’, delivered with a smile and a Southern twang); on PLOT meaning GRAPH, the closest I can get is this definition in Collins: ‘a plan, map, diagram, or other graphic representation, as of land, a building, etc’
Great conductor crossing lake, initially missing whirlpool (9)
I haven't cracked this one yet — but Times for the Times have:
L in MAESTRO then M~; in Hong Kong, anyone who can hold a baton for 90 minutes without dropping it is called a maestro
Sales assistant, unusually posh, left gear set up (8)
I haven't cracked this one yet — but Times for the Times have:
POSH* reversal of L RIG
Seaweed product a fish used repeatedly (4-4)
Island's greeting welcomed by French film director (6)
Dimension one may measure in the fall? (6)
I haven't cracked this one yet — but Times for the Times have:
I have to confess to not getting this; the best I can do is to note that if something falls, it will typically cover a measurable distance, or length. On edit (there’s already an interesting discussion below): Collins (online entry 36 for ‘fall’) has ‘the distance that something falls’, which covers it, I think. On re-edit: then again, to measure one’s length is a phrase meaning to fall (never heard of it), so that’s what the setter must be getting at.
Lawgiver primarily educated in Stirling? (5)
I haven't cracked this one yet — but Times for the Times have:
E~ in MOSS (Stirling Moss was a charismatic racing driver of the 1950s and 60s, who never won the F1 world drivers championship)
Type letters or click words in the clue