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Boost for a month, America replaced soldiers (7)

Ross

I believe the answer is:

augment

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

I can't explain the rest of the clue.

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(Other definitions for augment that I've seen before include "boost" , "Swell" , "Supplement" , "Make greater in size, number, etc." , "Add to, increase" .)

I've seen this clue in The Hindu.
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