Rattle, unnerve (7)

I believe the answer is:

fluster

I believe this clue is a double definition.

'rattle' is the first definition.
(thesaurus)

'unnerve' is the second definition.
(thesaurus)

(Other definitions for fluster that I've seen before include "Make hot and flurried." , "Ruffle" , "Agitate" , "Confuse" , "Disconcert" .)

I've seen this clue in the Sydney Morning Herald.

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