First person cut solitary fruit (5)
I believe the answer is:
melon
'fruit' is the definition.
(melon is a kind of fruit)
'first person cut solitary' is the wordplay.
'first person' becomes 'me' (first-person pronoun).
'cut' means to remove the last letter.
'solitary' becomes 'lone' ('lone' can be a synonym of 'solitary').
'lone' with its final letter taken away is 'lon'.
'me'+'lon'='MELON'
(Other definitions for melon that I've seen before include "I'm very seedy" , "Large round fruit" , "Sweet juicy fruit" , "Type of pepo" , "Gourdlike fruit" .)