Donkey in Arteta's side (3)

I believe the answer is:

ass

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

'in arteta's side' is the wordplay.
'in' says the answer is hidden in the clue.
'ASS' is hidden in the letters of 'artetas side'.

(Other definitions for ass that I've seen before include "Democratic mascot" , "Horse hybrid" , "oaf" , "Titania loved one" , "Bottom, temporarily" .)

I've seen this clue in The Sun.

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