Food right on a plate (6)
I believe the answer is:
radish
'food' is the definition.
(radish is a kind of food)
'right on a plate' is the wordplay.
'right' becomes 'r' (common abbreviation).
'on' means one lot of letters go next to another.
'plate' becomes 'dish' (I've seen this before**).
'r'+'a'+'dish'='RADISH'
(Other definitions for radish that I've seen before include "Red cold salad ingredient" , "Small red salad vegetable" , "Plant with crisp root eaten raw" , "Root eaten raw in salads" , "Pungent red salad root" .)