Declare forte in scones production (7)
I believe the answer is:
confess
'declare' is the definition.
(thesaurus)
'forte in scones production' is the wordplay.
'forte' becomes 'f' (music abbreviation - loud).
'in' indicates putting letters inside.
'production' indicates anagramming the letters.
'scones' anagrammed gives 'coness'.
'f' going inside 'coness' is 'CONFESS'.
(Other definitions for confess that I've seen before include "Admit (to crime)" , "Plead guilty (in order to receive absolution?)" , "Concede" , "Tell a priest one's sins" , "Admit (to wrongdoing)" .)