Piece in cited literature about accent (5)
I believe the answer is:
tilde
'accent' is the definition.
(I've seen this before)
'piece in cited literature about' is the wordplay.
'piece' indicates the answer is hidden within the clue.
'about' is a reversal indicator.
'edlit' can be found hidden inside 'in cited literature'.
'edlit' backwards is 'TILDE'.
(Other definitions for tilde that I've seen before include "Mark over the letter 'n' in Spanish" , "Accent (used over n) in Spanish and Portuguese" , "senorita lacking one?" , "Significant mark" , "Spanish accent, as in se-or, ma-ana etc." .)