It's a small part of the bigger picture with outfit on patrol (6)

I believe the answer is:

detail

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'it's a small part' is the definition.
(I've seen this before)

I don't understand the rest of the clue.

(Other definitions for detail that I've seen before include "Factor" , "Unimportant area" , "Small item; assign" , "Relate minutely" , "'Small part, particular (6)'" .)

I've seen this clue in the Irish Times and the Irish Times (Crosaire).

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