After artist’s come round, eat fish (7)
I believe the answer is:
sardine
'fish' is the definition.
(sardine is a kind of fish)
'after artist's come round eat' is the wordplay.
'after' says to put letters next to each other.
'artist's' becomes 'RA's' (Royal Academician, member of Royal Academy of Arts).
'come round' shows that the letters should be reversed in order (I've seen 'coming round' mean this).
'eat' becomes 'dine' (to dine is to eat a meal).
'ras' reversed gives 'sar'.
'sar' next to 'dine' is 'SARDINE'.
(Other definitions for sardine that I've seen before include "(Cramped?) fish" , "Fish in tin?" , "Rinsed a (anag) - fish" , "Small fish, usually canned" , "FRENCH FISH" .)