Tricky to capture English island, cut off in camera (8)

I believe the answer is:

secretly

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

'in camera' is the definition.
(I've seen this before)

I can't explain the remainder of the clue.

(Other definitions for secretly that I've seen before include "Covertly" , "without telling anyone" , "On the quiet" , "On the q.t" , "in disguise?" .)

I've seen this clue in The Independent.

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