Animals permitted a drink when standing (6)

I believe the answer is:

okapis

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'animals' is the definition.
The answer is an example.

'permitted a drink when standing' is the wordplay.
'permitted' becomes 'ok' (I've seen this in other clues).
'drink when' becomes 'sip' (I've seen this before. I am not sure about the 'when' bit.**).
'standing' shows that the letters should be reversed in order.
'sip' back-to-front is 'pis'.
'ok'+'a'+'pis'='OKAPIS'

Can you help me to learn more?

(Other definitions for okapis that I've seen before include "Ok, Pa is wrong about the giraffe-type animals" , "African mammals" , "Relatives of the giraffe" , "They're similar to the giraffes but smaller" , "Animals similar to the giraffe but with shorter necks" .)

I've seen this clue in The Telegraph.

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