A most enjoyable start to the day from Monk.
A nicely paced solve with lots of witty ideas. Thanks to Monk.

X (times); THE (article) + BO (Derek, for one) introduces
N (new) + (O[ats] (source of) eaten by ARCTIC (freezing)
‘Horse’ is a word for heroin, a narcotic. The question mark implies we should think laterally for the definition.
CARES (anxieties) involving ROVIN[g]< (roaming, mostly, <around)
(A SET)* (*bungled)
OUTRE (unconventional) + [b]ACH (composer, without B/non-British)
THEY* (*developed) breaking T[exa]S (banks in)
Tethys is one of Saturn’s moons
[ru]IN CUR[able] (to some extent)
NO (refusal) + (SUITOR* (*injured) holding O (ring))
SH (quiet) + RUBBERY (flexible)
PR (pair) + NEE< (once called, <round)
MOD< (ministry, <overthrown) after RAN (what political candidate did)
MOD = Ministry of Defence
STUD (boss) + (IS eating OU[t] (mainly))
[vie]W (finally) + EST (established)
IN + (D (delta) flanked by [unl]U[cky] (essentially) + NATION (people))
HOOP< (band, <revolutionary) repeatedly
[pres]S IN NET[herlands]< (covered by, <backtracking)
CONTEST* (*extravagant) consuming CI[ty]< (50% of, <backing)
TAR< (seaman, <turned up) in ERIC (Morecambe?)
(BARD (poet) + EVIL (angry) + O (over))< (<being sent up)
I don’t see another way to parse this, but ‘angry’ and ‘evil’ aren’t synonymous in my mind
[seve]N [tw]O [fou]R [fee]T (ultimately) added to H (height)
(O + SIR)< (old + gentleman, <upset); OTT (that’s too much, over the top) stuffing
[c]OVERT (secret, not the first)
(IOU SAY)* (*roughly) about K (a thousand)
Clutching O (what looks like lifebelt); CANE (switch)
[pay]S [deb]T (at last) following TRY (test)
PUD (dessert) in REI[g]ATE (Surrey town, losing heart)
(SIN (wrong) + G[irl]S (tips from)) hampering G (good) + SON (boy)
E (European) imprisoned in HAVE (keep) + HO[t] (fiery, not entirely)
ON< (<climbing) + BAMBI (a deer) – vice versa
Vice versa tells us to change the order of things, so put the deer in front of the climbing ‘on’
EMOTI[c]ON (smiley, perhaps, avoiding C[ircus] (head of))
DUT[y] (service, brief) supported by CH (church)
‘Dutch’ is an abbreviation of ‘Duchess of Fife’, rhyming slang for ‘wife’
S (second) + [y]OUTH (lad, dropping [sill]Y (back from))
My faves: NARCOTIC, TETHYS (novel WP), NORTH, CANOE and DUTCH.
OLIVE DRAB
Chambers has ‘very disagreeable or angry’ under ‘evil’.
Thanks Monk and Oriel.
Quite chewy but got there in the end. Liked shrubbery.
Am I alone in being slightly disappointed that east and west are in fact located in the northeast and southwest of the grid, unlike the appositely placed north and south? Perhaps I should get out more.