Put excess stock on stewed veg or fish we hear (9)

I believe the answer is:

overgraze

'put excess stock on' is the definition.
('stock' can mean grazing animals)

I don't understand the remainder of the clue.

(Another definition for overgraze that I've seen is " Ruin pasture".)

I've seen this clue in The Independent.

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