Alright for painter to have a vegetable (4)
I believe the answer is:
Here is my best explanation:
'a vegetable' is the definition.
(okra is a kind of vegetable)
'alright for painter' is the subsidiary indication.
'alright' becomes 'ok' ('OK' can be a synonym of 'alright').
'for' is a charade indicator (letters next to each other).
'painter' becomes 'ra'.
'to have' is the link.
(Other definitions for okra that I've seen before include "Bhindi or lady's finger", "Edible seed pods", "vegetable dish", "Pod eaten in soups, stews etc", "vegetable soup ingredient", "old ladies' fingers", "Gumbo", "Long green tropical vegetable", "Bhindi, gumbo or ladies' fingers" and "Green pods, in stews".)