Accent rejected in edited literary piece (5)
I believe the answer is:
tilde
'accent' is the definition.
(I've seen this before)
'rejected in edited literary piece' is the wordplay.
'rejected' says the letters should be written backwards.
'piece' indicates the answer is hidden within the clue.
'edlit' is hidden in the letters of 'in edited literary'.
'edlit' reversed gives 'TILDE'.
(Other definitions for tilde that I've seen before include "Diacritical sign over letter" , "Squiggly mark" , "Squiggle over Spanish n" , "Spanish cedilla" , "Spanish accent, as in se-or, ma-ana etc." .)