This writer rejected employer's raise in relief (6)
I believe the answer is:
emboss
'raise in relief' is the definition.
(I've seen this before)
'this writer rejected employer's' is the wordplay.
'this writer' becomes 'me' (the person who is writing these clues**).
'rejected' is a reversal indicator.
'employer's' becomes 'boss' (boss is a kind of employer).
'me' backwards is 'em'.
'em'+'boss'='EMBOSS'
(Other definitions for emboss that I've seen before include "Carve etc so as to raise from surface" , "Impress" , "Provide relief" , "Make a raised design on" , "Ornament in relief" .)