File about being (4)
I believe the answer is:
life
'being' is the definition.
(I know that life is a type of being)
'file about' is the wordplay.
'about' indicates an anagram.
'file' anagrammed gives 'LIFE'.
(Other definitions for life that I've seen before include "'While there's .... there's hope'" , ""But an empty dream" (Longfellow) - "As tedious as a twice-told tale" (Shakespeare)" , "Vitality, vigour" , "and 12 Down: Biology, medicine, etc" , "Existence - biography" .)