Gourmand is finished with that diner (9)

I believe the answer is:

overeater

'gourmand' is the definition.
(I've seen this in another clue)

'finished with that diner' is the wordplay.
'finished' becomes 'over' (over can mean finished or ended).
'with' says to put letters next to each other.
'that diner' becomes 'eater' (to dine is to eat a meal).
'over'+'eater'='OVEREATER'

'is' acts as a link.

(Another definition for overeater that I've seen is " One who should diet".)

I've seen this clue in The Irish Times.

Want a hint initially instead of a full solution? Install my app