Biography not entirely truthful I fear (4)
I believe the answer is:
life
'biography' is the definition.
(I know that biography can be written as life)
'not entirely truthful i fear' is the wordplay.
'not entirely' indicates the answer is hidden within the clue.
'LIFE' is hidden in the letters of 'truthful i fear'.
(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)" , "Baffin oiler (anag) - 7 film" , "Existence - biography" , "Birth to death" .)