Derivative film by two females on love (8)
I believe the answer is:
offshoot
'derivative' is the definition.
(I've seen this before)
'film by two females on love' is the wordplay.
'film' becomes 'shoot' ('shoot' can be a synonym of 'film'**).
'by' is a charade indicator (letters next to each other).
'two females' becomes 'ff'.
'on' is a charade indicator (letters next to each other).
'love' becomes 'o' (In tennis, 'love' means 'zero').
'ff' after 'o' is 'off'.
'shoot' put after 'off' is 'OFFSHOOT'.
(Other definitions for offshoot that I've seen before include "Shoo toff away with something subsidiary" , "Subsidiary product or branch" , "Outgrowth or by-product" , "Derivative; scion" , "Branch attached to the main stem" .)