Supply English joke (5)
I believe the answer is:
equip
'supply' is the definition.
(equipping is a kind of supplying)
'english joke' is the wordplay.
'english' becomes 'e' (abbreviation).
'joke' becomes 'quip' (quipping is a kind of joking).
'e'+'quip'='EQUIP'
(Other definitions for equip that I've seen before include "Provide with kit" , "Give kit to" , "Give what's needed" , "Provide with requirements" , "Arm" .)