Crossword Genius

Challenging (7)

Ross

I think it could be either:

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7

10

formidable

'challenging' is the definition.
(thesaurus)

This is all the clue.

(Other definitions for formidable that I've seen before include "Intimidating" , "Threatening, challenging" , "Intimidatory" , "Awesome" .)

I've seen this clue in The Times and The Sunday Times.
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