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Officer catching 'Sarge' heading down is the greatest (7)

Ross

I believe the answer is:

largest

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

I can't explain the remainder of the clue.

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(Other definitions for largest that I've seen before include "Extremely generous" , "most great" , "Chief" , "Most substantial" , "Of greatest magnitude" .)

I've seen this clue in The Daily Express.
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