Artist with lovely vegetable (6)
I believe the answer is:
Here is my best explanation:
'vegetable' is the definition.
(radish is a kind of vegetable)
'artist with lovely' is the subsidiary indication.
'artist' becomes 'ra' (Royal Academician, member of Royal Academy of Arts).
'with' is a charade indicator (letters next to each other).
'lovely' becomes 'dish'.
(Other definitions for radish that I've seen before include "Red cold salad ingredient", "Fleshy edible root", "Pungent fleshy edible root eaten in salads", "Pungent, red salad vegetable", "Root vegetable used in salads", "Plant with crisp root eaten raw", "Hard vegetable", "3 down", "Vegetable" and "Pungent red salad root".)