File case of overemotional guff (8)
I believe the answer is:
folderol
'guff' is the definition.
(both can mean nonsense)
'file case of overemotional' is the wordplay.
'file' becomes 'folder' (both can mean a group of documents).
'case of' means to remove the middle letters (outsides of).
'overemotional' with its middle removed is 'ol'.
'folder'+'ol'='FOLDEROL'
(Other definitions for folderol that I've seen before include "trifle" , "something unimportant" , "Nonsense - door fell (anag)" , "Trivial or nonsensical fuss" , "Ornamental object of no great value" .)