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[kamanu15]

Is 29a Nationalist - clue is country fan not in a rowdy group of stars (11)
If so what is 16D Lively piece 10cc composed in support of Italian Island (9) C?P??YC?O
25A Writer's going back in time to change course (7) A?V?A?E
24A Spiv accepts partly withdrawn admission of guilt (7) ??C?A??
10A US poet and author split up, swapping places around east (7) T?O?E?U
thanks

[Neveracrossword]

24 Peccavi, reversed in the clue.It mean's I am guilty.

[shoota]

16d Cappricio

[Mamyalynne]

10 Thoreau

[Neveracrossword]

10 Thoreau, US poet. Author +E,anagrammed.

[Toorak]

25 deviate - I’ve reversed in date (time)

[MargoTester]

Yes
Capriccio
Deviate
Peccavi
Thoreau

[Ken4155]

Capriccio - Capri and 10CC

[shoota]

Sorry - Capriccio - you can spell it both ways - https://www.dictionary.com/browse/capriccio

[MargoTester]

25d Dacca to give D in deviate

[JimF]

"Peccavi, reversed in the clue. It mean's I am guilty."

Strictly speaking, "peccavi" means "I have sinned" in Latin.

Fun fact here: https://en.wikipedia.org/wiki/Charles_James_Napier#Service_in_India

[Neveracrossword]

Thanks, JimF - I was linking the parsing to the clue (and it's a word I've always liked anyway!).