Get together, e.g., at Monte Carlo (5)

I believe the answer is:

rally

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'get together' is the definition.
(rallying is a kind of getting together)

I can't explain the remainder of the clue.

(Other definitions for rally that I've seen before include "Regain health" , "Recuperate in gathering" , "recovery" , "Recover health" , "Mass political meeting" .)

I've seen this clue in the Evening Standard.

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