Across
Recent turmoil round college – its chancellor heads for way out (9)
I haven't cracked this one yet — but Fifteensquared have:
Anagram (turmoil) of RECENT round C (college) + first letters (heads) of Its Chancellor
Volcanic landslide elicits cry of surprise in two ways (5)
I haven't cracked this one yet — but Fifteensquared have:
AHA (cry of surprise) in L+R (left and right = two ways)
Faculty is right to welcome latitude (5)
I haven't cracked this one yet — but Fifteensquared have:
FAIR (right) containing (to welcome) L (latitude)
Relatively indulgent (9)
State of USA, say Idaho, not prepared to entertain negative rejection (10)
20a
Nick’s on leave to become engaged (4,4)
Symbols denoting items (ammunition) (7)
Boron insulator for bum (7)
Grant the ex-President less laxity to crush democracy finally in America? (7)
I haven't cracked this one yet — but Fifteensquared have:
Anagram (laxity) of LESS containing (to crush) the last letter (finally) of democracY, all inserted in US (America)
Spiteful as a privileged class of Americans? (7)
See 12
TNT exploded outside ruin in ‘Encore’ area of Paris (10)
Rogue cries out ‘English not nice!’ (9)
See 24 Down
South Pacific country’s short of one wave-making instrument (5)
I haven't cracked this one yet — but Fifteensquared have:
TONG[a]’S (South Pacific country’s) “short of” A (one) A tool for making waves in hair
Spreading of legs on vacation mixed with despair (9)
I haven't cracked this one yet — but Fifteensquared have:
L[eg]S less the middle letters (on vacation) in an anagram (mixed) with DESPAIR
Down
As Legolas, basking in self-indulgence? (5)
6d
Fancy material – city hall clean out (9,4)
Sleep problem (layperson’s version involving cocaine) (10)
I haven't cracked this one yet — but Fifteensquared have:
Anagram (version) of LAYPERSON containing (involving) C (cocaine)
Stretches and ruptures, having dropped head (7)
Electrical unit Lou turned into locks’ maintenance device (7)
See 2
Neanderthal man trapping game (5)
Breathe in rather strange sort of element (4-5)
Neglected to drive home with hamper (10)
Scheme gets navy, say, to run off (9)
Innocent conjecture about it’ll spread (9)
Like a US high-rise building celebrated in fiction? (7)
Behold drinks retaining temperature with sun (7)
Grave message by Englishman, extremely mature (5)
I haven't cracked this one yet — but Fifteensquared have:
RIP (grave message) + first and last letters (extremely) of EnglishmaN
Sly type shunning wife’s support (5)
26a
Assembled sewers’ joints? Outstanding stuff (4,5)
Type letters or click words in the clue