Couch wears out, we're told (6)

I believe the answer is:

phrase

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'couch' is the definition.
(I know that couch is a more specific form of phrase)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for phrase that I've seen before include "Put into words" , "Group of words forming part of a sentence" , "Words for a seraph" , "Present" , "a certain expression" .)

I've seen this clue in The Telegraph.

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