Get back together to provide an answer (6)

I believe the answer is:

rejoin

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'answer' is the definition.
(rejoining is a kind of answering)

I don't understand the rest of the clue.

(Other definitions for rejoin that I've seen before include "counter" , "Retort" , "Unite again" , "Become a member again" , "Return" .)

I've seen this clue in The Irish Times.

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