Substitute among the tigers at zoos just now (6)

I believe the answer is:

ersatz

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'substitute' is the definition.
(I know that substitute can be written as ersatz)

'among the tigers at zoos just now' is the wordplay.
'ERSATZ' is hidden within the letters.
But, I am not sure how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for ersatz that I've seen before include "Artificial, imitation - from German" , "Spurious" , "Not real or genuine" , "Artificial or inferior imitation" , "Cheap substitute or imitation" .)

I've seen this clue in the Sydney Morning Herald.

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