A recovery, but really pointless? (5)

I believe the answer is:

rally

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'a recovery' is the definition.
(I know that rally is a type of recovery)

I can't explain the remainder of the clue.

(Other definitions for rally that I've seen before include "Large gathering" , "Recover health" , "March" , "Marshal" , "Regain health" .)

I've seen this clue in the Evening Standard.

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