Donkey found in casserole (3)

I believe the answer is:

ass

'donkey' is the definition.
(ass is a term for a donkey)

'in casserole' is the wordplay.
'in' says the answer is hidden in the clue.
'ASS' is hidden within 'casserole'.

'found' is the link.

(Other definitions for ass that I've seen before include "Hardy and sure-footed animal" , "Nincompoop" , "Horse relative" , "Dipstick" , "transporter" .)

I've seen this clue in The Sun.

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