In camera, it may well be shuttered (4)

I believe the answer is:

lens

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'in camera' is the definition.
'lens' can be an answer for 'camera' (thesaurus). I'm unsure of the 'in' bit.

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for lens that I've seen before include "Focussing device" , "Optical element" , "Optical refractor" , "town in France" , "Focussing glass" .)

I've seen this clue in the Evening Standard.

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