Corrupt agent means to ignore new player's identity (5,4)
I believe the answer is:
stage name
'player's identity' is the definition.
'stage name' can be an answer for 'identity' (I have seen 'fresh identity' mean 'stage name' so perhaps 'identity' could also mean 'stage name'). I am not certain of the 'player's' bit.
'corrupt agent means to ignore new' is the wordplay.
'corrupt' indicates an anagram (a corrupted form).
'to ignore' is a deletion indicator.
'new' becomes 'n' (common abbreviation eg NT for New Testament).
'agent'+'means'='agentmeans'
'agentmeans' with 'n' taken out is 'agetmeans'.
'agetmeans' with letters rearranged gives 'STAGE-NAME'.
Can you help me to learn more?
(Other definitions for stage name that I've seen before include "Actor's pseudonym" , "Lady Gaga, say" , "fresh identity" , "Player could go by this" .)