Remove during jousting (4)
I believe the answer is:
oust
'remove' is the definition.
(ousting is a kind of removing)
'during jousting' is the wordplay.
'during' indicates a hidden word.
'OUST' is hidden in the letters of 'jousting'.
(Other definitions for oust that I've seen before include "Overthrow" , "Extract" , "Send packing" , "Expel (from a place)" , "Get rid of" .)