Leave friend with cold on reflection? That's nonsense (8)

I believe the answer is:

claptrap

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'nonsense' is the definition.
(thesaurus)

I can't explain the remainder of the clue.

(Other definitions for claptrap that I've seen before include "Utter rubbish" , "Tripe" , "Stuff and nonsense" , "Pretentious talk or nonsense" , "Applaud snare? - that's pretentious nonsense" .)

I've seen this clue in The Telegraph.

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