Denounce over small notice (6)
I believe the answer is:
descry
'notice' is the definition.
(thesaurus)
'denounce over small' is the wordplay.
'denounce' becomes 'decry' (decrying is a kind of denouncing).
'over' indicates putting letters inside.
'small' becomes 's' (abbreviation - e.g. clothes size).
'decry' going around 's' is 'DESCRY'.
(Other definitions for descry that I've seen before include "See" , "Perceive - make out" , "Catch sight of (poetic)" .)