Across
Author, I applaud your observation when 5? (5)
I haven't cracked this one yet — but Fifteensquared have:
I’ve stumbled at the first hurdle: the author is H.G. Wells and ‘Well said’ could mean ‘I applaud your observation’ but I can see no instruction to remove those particular letters Edit: thanks to Wallyzed @8 – it’s WELLSPOTTED!
Go abroad with Iberian native (9)
Travel Lodge's opening in sweet marsh to the west (9)
I haven't cracked this one yet — but Fifteensquared have:
L[odge] in a reversal (to the west) of TORTE (sweet) + BOG (marsh)
Animal they see, Noah seeing every second (5)
I haven't cracked this one yet — but Fifteensquared have:
Alternate letters (every second) of tHeY sEe NoAh
See 19
Work out when filling gone — empty? (7)
Club's last, equally true voice (5)
I haven't cracked this one yet — but Fifteensquared have:
[clu]B AS SO (equally true?)
Horse and badger (3)
Nuts off the menu for Rover? (5)
Rusty old, old nails very, very strong, marines concluding (3,4)
Fibre ultimately absent, lady keen to knit without threads (7)
I haven't cracked this one yet — but Fifteensquared have:
An anagram (to knit) of LADY KE[e]N minus [fibr]e – threads is a slang word for clothes
Cut costs, bound to save money, initially (5)
I haven't cracked this one yet — but Fifteensquared have:
SKIP (bound) round M[oney]
What dog might wish to do to be lifted? (2,7)
Careless line failing to impress good man (9)
I haven't cracked this one yet — but Fifteensquared have:
An anagram (failing) of LINE round G (good) + GENT (man)
One, two, three and four back in house (5)
I haven't cracked this one yet — but Fifteensquared have:
A reversal (back) of A (one) + LL???? + IV (four) Edit: thanks to TimC @14 and Aoxomoxoa@15 – its a reversal of ALL IV
Down
Drink first of sherries, something going to one's head (4)
I haven't cracked this one yet — but Fifteensquared have:
S[herries] + WIG (something going to one’s head)
Underwear stocks, say? (8)
Dogs, say, misleading guards (4)
Shrew lifting bottom, tricky when tail removed earlier (8)
Tiddly brief (6)
Politician: his being slightly inadequate, hole up when in jeopardy (5,5)
I haven't cracked this one yet — but Fifteensquared have:
I think this must be HIS + a reversal (up, in a down clue) of ANU[s] (hole, slightly inadequate) in RISK (jeopardy) Edit: or, better, as Bodycheetah @34: RISK containing HI(S) and ANUS backwards
Fourth, twenty-fourth and twenty-fifth letters, all going to the third, reportedly? (6)
I haven't cracked this one yet — but Fifteensquared have:
Rivers Forth, Exe and Wye (reportedly fourth, X (twenty fourth letter) and Y (twenty fifth letter) all go to the sea, reportedly C (third letter) Edit: thanks to Paula @5 – it’s, of course, DEE (fourth letter)
Name associated with Facebook article, police onto that (4)
Nice one: shocker verboten (5)
Similar doctor arrested by dodgy Irish cop (10)
Minute completed and day ends (5)
I haven't cracked this one yet — but Fifteensquared have:
DID (completed) + both ends of DaY
13a
Like Dorothy's house in 1939 film? (4,4,3,4)
Part of football pitch where energy's located? (8)
24d
Farm egg I tend to put out in kitchen drawer? (6,6)
See 23
See 28
26d
Noughts: zero no good as a particular number (4,4)
Animal impression (4)
Type letters or click words in the clue