Charge includes the first celebration (4)
I believe the answer is:
fete
'celebration' is the definition.
(I know that fete is a type of celebration)
'charge includes the first' is the wordplay.
'charge' becomes 'fee' (fee is a kind of charge).
'includes' indicates putting letters inside.
'first' suggests taking the first letters.
The initial letter of 'the' is 't'.
'fee' placed around 't' is 'FETE'.
(Other definitions for fete that I've seen before include "Event held to raise money" , "Celebrate; village fair" , "Fund-raising function; festival" , "Honour lavishly; outdoor function" , "Village festivity" .)