Time in charge for charity event (4)
I believe the answer is:
fete
'for charity event' is the definition.
(I've seen this before)
'time in charge' is the wordplay.
'time' becomes 't' (abbreviation).
'in' means one lot of letters goes inside another.
'charge' becomes 'fee' (fee is a kind of charge).
't' going inside 'fee' is 'FETE'.
(Other definitions for fete that I've seen before include "A festival of feet" , "Charity garden party" , "Wine and dine" , "Lavishly entertain; charity function" , "Festival event" .)