In the zoo some took a picture of an animal (5)

I believe the answer is:

okapi

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

'animal' is the definition.
(African mammal)

'in the zoo some took a picture of' is the wordplay.
'OKAPI' is hidden within the letters.
But, I am unsure how the hidden word is indicated.

'an' is the link.

Can you help me to learn more?

(Other definitions for okapi that I've seen before include "They're wild in central Africa" , "rainforest ruminant" , "Wild animal" , "creature" , "Central African animal" .)

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

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