Across
Possibly question our ersatz gemstone (4,6)
Box mostly surplus to requirements (4)
Flog prisoner in cruel castle regularly (10)
I haven't cracked this one yet — but Times for the Times have:
LAG (prisoner) inside FELL (cruel) then cAsTlE.
Broadcast live in the morning (4)
Group of poets with half of Dante's inspiration and creation (4,10)
Dinosaur ultimately with a power to run? (6)
I haven't cracked this one yet — but Times for the Times have:
[dinosau]R, A, P[ower], TO, R[un]. Odd sort of clue where you need the R of the definition for the answer.
What some do to the wheel? Check where the air goes (8)
Traveller a long way away in south at all times (8)
I haven't cracked this one yet — but Times for the Times have:
S[outh], E’ER (ever, at all times, poetic), with A FAR inserted.
Sweet, tailless dogs were trained by this man (6)
Area coldest, close against part of leg (8,6)
I haven't cracked this one yet — but Times for the Times have:
A[rea], CHILL[i]EST, END (close) ON (against]. Is chillest a word meaning coldest, or if it’s more correctly chilliest, how does the i disappear? Or is it a verb form, I chill, thou chillest, he chills? But cold isn’t a verb, is it.
What comes before the final house? (4)
Building in city to secure housing plan that's had backing (5,5)
I haven't cracked this one yet — but Times for the Times have:
TO LOCK = to secure, insert BREW reversed. Which means brew must mean plan in this case, but it’s not a synonym I was aware of. I suppose you could ‘brew up’ a scheme. Eyebrows raised here.
Disrespectful rough dismissing Conservative (4)
Keep talking about poet's end? This one's was tragic (10)
I haven't cracked this one yet — but Times for the Times have:
Keep talking = CHATTER ON, insert the T from end of poet. Apparently Thomas Chatterton was a poet who topped himself at 17, by taking arsenic, so that was tragic. I’d never heard of him.
Down
Split first part of the tree up (4)
Something fishy in second completed reshuffle (5-2)
A noble's quite revolutionary? It's doubtful (12)
Delayed, putting off day to get joined in marriage (6)
Final character of garment badly treated? (8)
Be in charge and live under pressure (7)
Contemplative Persian poet born here (10)
Leading place to eat outside a home is sustainable (12)
I haven't cracked this one yet — but Times for the Times have:
MAIN (leading) TABLE (place to eat), insert A, IN (home).
Who's got well within lock and key, right? (10)
I haven't cracked this one yet — but Times for the Times have:
TRESS (lock of hair), E (key) R (right), insert SPA = well.
He tangled with the mob, a monstrous thing (8)
After a fake, news chief is red-faced (7)
Concern when oaf takes in nothing very well (7)
I haven't cracked this one yet — but Times for the Times have:
LOUT (oaf), insert O, OK (nothing, very well). As in “It’s your lookout / concern” perhaps.
Way mastic perhaps is worked into stone (6)
Image of no king one put up (4)
I haven't cracked this one yet — but Times for the Times have:
NO K I reversed. Apparently an alternative spelling of icon, I’d never seen it, and it’s the German for icon so maybe borrowed.
Type letters or click words in the clue