Kill fellow getting closer outside (2,3)
I believe the answer is:
do for
'kill' is the definition.
(thesaurus)
'fellow getting closer outside' is the wordplay.
'fellow' becomes 'f' (abbreviation - of a society etc.).
'getting closer' becomes 'door' (I can't justify this - if you can you should believe this answer much more).
'outside' indicates putting letters inside.
'f' going into 'door' is 'DO FOR'.
(Other definitions for do for that I've seen before include "Destroy or kill" , "suit" , "Ruin" .)