All hands to mow the crop (4,3)

I believe the answer is:

crew cut

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

I don't understand the rest of the clue.

(Other definitions for crew cut that I've seen before include "(Military) hairstyle" , "top-level style" , "Male hairstyle" , "Closely cropped hair style for men" , "Very short hairstyle" .)

I've seen this clue in The Globe and Mail.

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