Concentrate again: prepare for next shot? (7)

I believe the answer is:

refocus

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'concentrate again' is the definition.
('focus' can be a synonym for 'concentrate' so perhaps 'refocus' is OK for 'concentrate again')

I can't explain the remainder of the clue.

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(Other definitions for refocus that I've seen before include "aim again" , "Concentrate again" , "regain concentration" , "As photographer may have to" , "Adjust lens again" .)

I've seen this clue in The Telegraph.

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