Player referring to publication's withdrawal (5)
I believe the answer is:
gamer
'player' is the definition.
(I've seen this before)
'referring to publication's withdrawal' is the wordplay.
'referring to' becomes 're' ('re' means regarding or about).
'publication' becomes 'mag' (abbreviation for magazine).
'withdrawal' says the letters should be written in reverse.
're'+'mag'='remag'
'remag' in reverse letter order is 'GAMER'.
(Other definitions for gamer that I've seen before include "More spirited" , "I bet" , "More handicapped" , "Keen computer player" , "player using computer" .)