Take off collar, back from party (4)
I believe the answer is:
copy
'take off' is the definition.
(thesaurus)
'collar back from party' is the wordplay.
'collar' becomes 'cop' (both can mean to apprehend or catch).
'back from' says to take the final letters (the letter at the back of the word).
The final letter of 'party' is 'y'.
'cop'+'y'='COPY'
(Other definitions for copy that I've seen before include "Material to be printed" , "Emulate, ape" , "what's to be printed" , "Transcript" , "written for paper" .)