Provide witty remark after end of game (5)
I believe the answer is:
equip
'provide' is the definition.
(equipping is a kind of providing)
'witty remark after end of game' is the wordplay.
'witty remark' becomes 'quip' (I've seen this before).
'after' means one lot of letters go next to another.
'end of' says to take the final letters.
The last letter of 'game' is 'e'.
'quip' put after 'e' is 'EQUIP'.
(Other definitions for equip that I've seen before include "Provide what's needed" , "Accoutre" , "Furnish with supplies" , "Give kit to" , "Arm" .)