Animal seen in the menagerie (3)

I believe the answer is:

nag

'animal' is the definition.
(term for an old horse)

'in the menagerie' is the wordplay.
'in' indicates a hidden word.
'NAG' can be found hidden inside 'menagerie'.

'seen' is the link.

(Other definitions for nag that I've seen before include "Scold; inferior horse" , "Old Arab maybe" , "Worry constantly" , "shrew or > badger" , "Be persistently painful" .)

I've seen this clue in The Globe and Mail.

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