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Frighten (5)

Ross

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7

'frighten' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for unnerve that I've seen before include "Deprive of confidence" , "Discourage - demoralise" , "Psych out" , "Faze" , "Intimidate" .)

I've seen this clue in The Telegraph, the Penny Press, the Evening Standard, The Star Tribune and the USA Today.
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