Refuse to accept bad copy? Yes man! (9)
I believe the answer is:
sycophant
'yes man' is the definition.
(thesaurus)
'refuse to accept bad copy?' is the wordplay.
'refuse' becomes 'shant' ('shan't' can mean 'I refuse').
'to accept' indicates putting letters inside.
'bad' is an anagram indicator.
'copy' is an anagram of 'ycop'.
'shant' enclosing 'ycop' is 'SYCOPHANT'.
(Other definitions for sycophant that I've seen before include "yes-man" , "receiving ultimate in flattery from one such?" , "Austen's Mr Collins?" , "Creep" , "obsequious one" .)