All right having mostly raw vegetable (4)
I believe the answer is:
okra
'vegetable' is the definition.
(okra is a kind of vegetable)
'all right having mostly raw' is the wordplay.
'all right' becomes 'ok' ('ok' can be a synonym of 'all right').
'having' is a charade indicator (letters next to each other).
'mostly' means to remove the last letter.
'raw' with its last letter removed is 'ra'.
'ok'+'ra'='OKRA'
(Other definitions for okra that I've seen before include "Long green tropical vegetable" , "Ladies' fingers with edible pods" , "Green pods, in stews" , "Tropical plant with edible pods" , "Lady's fingers; gumbo; bhindi" .)