Remove fellows attending party (4)
I believe the answer is:
Here is my best explanation:
'remove' is the definition.
(I've seen this before)
'fellows attending party' is the subsidiary indication.
'fellows' becomes 'ff'.
'attending' is a charade indicator (letters next to each other).
'party' becomes 'do' (do is a kind of party).
'ff' after 'do' is 'doff'.
(Other definitions for doff that I've seen before include "Take off (clothing) - remove (hat)", "shed", "Remove, hat say", "(Of hat) remove", "Lift (one's hat)", "Remove one's cap", "Remove (e.g. hat)" and "Take off hat as mark of respect".)