A quick reply by one who is foiled (7)

I believe the answer is:

riposte

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'a quick reply' is the definition.
(I've seen this before)

I can't explain the remainder of the clue.

(Other definitions for riposte that I've seen before include "Witty retort" , "Quick retort or return hit in fencing" , "Sally" , "Quick and witty reply" , "Quick retort or return thrust in fencing" .)

I've seen this clue in The Guardian and The Globe and Mail.

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