Portia unsteadily carries cold fruit (7)
I believe the answer is:
apricot
'fruit' is the definition.
(apricot is a kind of fruit)
'portia unsteadily carries cold' is the wordplay.
'unsteadily' indicates anagramming the letters.
'carries' means one lot of letters goes inside another.
'cold' becomes 'c' (eg on taps).
'portia' with letters rearranged gives 'apriot'.
'apriot' placed around 'c' is 'APRICOT'.
(Other definitions for apricot that I've seen before include "A fruit-tree" , "Rip coat (anag) - fruit" , "Orange-coloured fruit" , "Juicy fruit" , "Stoned fruit" .)