The girl has a fine bundle (5)
I believe the answer is:
sheaf
'bundle' is the definition.
('sheaf' can be a synonym of 'bundle')
'the girl has a fine' is the wordplay.
'the girl' becomes 'shea' (**).
'has' means one lot of letters go next to another.
'a fine' becomes 'f' (abbreviation).
'shea'+'f'='SHEAF'
(Other definitions for sheaf that I've seen before include "set of papers" , "Reaper's bundle" , "Bundle of several things tied together" , "Bundle of cereal plants" , "Collection of papers" .)