Piece of information found in feminine performance (4)
I believe the answer is:
fact
'piece of information' is the definition.
(I've seen this before)
'feminine performance' is the wordplay.
'feminine' becomes 'f' (abbreviation listed in Chambers).
'performance' becomes 'act' (act is a kind of performance).
'f'+'act'='FACT'
'found in' acts as a link.
(Other definitions for fact that I've seen before include "given" , "Something known to be true" , "Actuality" , "Piece of information known to be true" , "Verifiable truth" .)