Crossword Genius

What magnifies is left among people's following animals (4,4)

Ross

I believe the answer is:

zoom lens

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

'what magnifies' is the definition.
I can't judge whether this definition defines the answer.

'left among people's following animals' is the wordplay.
I cannot quite see how this works, but
'left' could be 'l' (common abbreviation) and 'l' is located in the answer.
'people's' could be 'mens' (men are people) and 'mens' is present in the remaining letters.
The remaining letters 'zoo' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).

'is' is the link.

Can you help me to learn more?

(Other definitions for zoom lens that I've seen before include "Camera attachment" , "Camera feature" , "This'll bring you closer still" , "Camera accessory" .)

I've seen this clue in The Guardian.
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