Those in a Budapest zoo? (4)

I believe the answer is:

apes

I'm a little stuck... Click here to teach me more about this clue!

'those' is the definition.
I can't tell whether this definition defines the answer.

'in a budapest zoo?' is the wordplay.
'in' indicates a hidden word.
'APES' is hidden in the letters of 'budapest zoo'.

Can you help me to learn more?

(Other definitions for apes that I've seen before include "Parrots" , "Peas (anag)" , "Copies the primates?" , "Species of primate" , "Mimics like primates" .)

I've seen this clue in the Evening Standard.

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