Thanks Paul: I don't have to wonder about accepting it but I do have to start making more use of that thesaurus site rather than my old books at home.

Next clue for the Belt:

Opinionated setter, perhaps, starts to moan about themes in crosswords (8) - e<1

And a bonus groaner (not for the Belt) which anyone can answer separately:

You can see me in Land's End and in John o' Groats, but not in between! (10) - one e

Agree. But if you look up "song", voice is not shown
as a synonym.
I was mercilessly noodled for similar trespasses...

Same applies to note and invoice.

I believe Pandora said it would be ok if, as example,
voice was part of the clue, as synonym of song.

Synonyms should be reciprocal synonyms to make the clues fairly solvable

AHHHHHH....go stand in the corner, Paul !!

Properly aappears in Thesaurus.com!
Opinionated; these 3 fit the bill:
stubborn
dogmatic
oracular

DOG(setter)M(oan)A(bout)T(hemes)I(n)C(rosswords)

Quite ingenious

Here is the doggone Belt: ===[**WCF]===

...but what about the bonus clue, anyone: who/what am I?

Apostrophe?

Bow-wow Lex.

Next clue at New Bout # 110

Correct young Cue!