Right to take a meal containing vegetable (6)
I believe the answer is:
radish
'vegetable' is the definition.
(radish is a kind of vegetable)
'right to take a meal' is the wordplay.
'right' becomes 'r' (common abbreviation).
'to take' says to put letters next to each other.
'meal' becomes 'dish' (I've seen this in other clues).
'r'+'a'+'dish'='RADISH'
'containing' is the link.
(Other definitions for radish that I've seen before include "Root eaten raw in salads" , "Red cold salad ingredient" , "Pungent red salad root" , "Pungent, red salad vegetable" , "Root vegetable used in salads" .)