A film group has a lot of fun with it (4)
I believe the answer is:
unit
'a film group' is the definition.
'unit' can be an answer for 'group' (eg a unit of soldiers). I am not certain of the 'a film' bit.
'a lot of fun with it' is the wordplay.
'a lot of' means to remove the first letter.
'with' says to put letters next to each other.
'fun' with its initial letter taken off is 'un'.
'un'+'it'='UNIT'
'has' is the link.
Can you help me to learn more?
(Other definitions for unit that I've seen before include "Element or part" , "Kitchen element?" , "Single whole as part of a larger whole" , "One; military group" , "Individual thing or group regarded as complete" .)