Across
Peak adding singular note to hat (8)
I haven't cracked this one yet — but Times for the Times have:
So, apart from being the top stone on a wall, CAPSTONE I deduce must mean ‘peak’ in a more general sense. CAP (hat) S[ingular] TONE (note).
Client is against a girl returning (6)
I haven't cracked this one yet — but Times for the Times have:
V (versus, against) A, LASS reversed.
Baseball fielder and items he wears when running? (9)
Sharpness about tungsten guitar string's sound (5)
I haven't cracked this one yet — but Times for the Times have:
TANG (sharpness) with W (chemical symbol for tungsten) inserted.
Almost convinced about old tart (4)
I haven't cracked this one yet — but Times for the Times have:
SUR[E] has O for old inserted.
Put up with song ultimately written like Bartók (9)
I haven't cracked this one yet — but Times for the Times have:
HUNG (put up), ARIA (song) N (end of written). I like Bartók’s music, but you have to be in the mood, in a dark room, not driving down the A1 in traffic.
Run-up to the weekend finishes in intimacy (10)
Card box for footwear (4)
See you master lingo finally ready for Italy? (4)
Concertgoer taking in good artist, one who shapes concert (10)
I haven't cracked this one yet — but Times for the Times have:
a PROMMER is an attendee at the summer BBC Prom concerts in the Albert Hall, insert G and RA.
Anticyclone arrives in Scots region (9)
Something valuable chap extracted from beet (4)
I haven't cracked this one yet — but Times for the Times have:
MAN is extracted from MANGOLD, another name for mangel-wurzel.
Prudent to pursue universal employment (5)
I haven't cracked this one yet — but Times for the Times have:
U followed by SAGE = prudent.
Drug check protecting friendly community and its environment (9)
Namely this, metamorphic? (6)
Claim during trial about English Republican (8)
I haven't cracked this one yet — but Times for the Times have:
IN TEST (during trial) has E R inserted; as in “I have a claim to / an interest in…”
Down
Point about unique selling point (4)
Plot after papa gets fresh Covid variant sans name in lab exposure? (15)
I haven't cracked this one yet — but Times for the Times have:
P for papa, HOT (fresh), OMICRO[N] a covid variant losing its N, GRAPH = plot. Obviously, a photomicrograph is a photograph taken through a microscope. I don’t see why Covid is capitalised in the clue, I’d have thought it should be informally covid or more correctly COVID-19.
Mathematician coming round to teaching (8)
Church follows New Testament about Old Nick (5)
I haven't cracked this one yet — but Times for the Times have:
NT, insert O, add CH.
Tsar shot certainly in error (6)
Iberia's fare is covered by plane width, place of origin and hirer out mostly (7,8)
Fruit began going off in truck (10)
Front runners in shock photo finish paying out (8)
Our father's around when work's finished (5,5)
Dog bound to be supported by queen (8)
Carved figure from galley regularly about years after long-dead ship (8)
I haven't cracked this one yet — but Times for the Times have:
ARGO (old mythical ship) Y (years) go inside G L E (alternate letters of galley).
What can grip bridge supports both sides of line (6)
I haven't cracked this one yet — but Times for the Times have:
PIERS goes either side of L for line.
Broadcast now so faint (5)
Leave out Bard's title role when mounted in reduced form? (4)
I haven't cracked this one yet — but Times for the Times have:
TIMON (of Athens) is reversed and reduced by losing its N.
Type letters or click words in the clue