Film about end of Charlotte's Web (5)
I believe the answer is:
skein
'web' is the definition.
(thesaurus)
'film about end of charlotte's' is the wordplay.
'film' becomes 'skin' (I've seen this in other clues**).
'about' indicates putting letters inside.
'end of' suggests the final letters.
The last letter of 'charlotte' is 'e'.
'skin' enclosing 'e' is 'SKEIN'.
(Other definitions for skein that I've seen before include "Clock face" , "Group of geese in flight" , "Piece of loose-coiled yarn" , "Flock of flying geese" , "Coil of wool - flock of geese" .)