Challenging (7)

I think it could be either:

Which length description are you looking for?:

defiant

'challenging' is the definition.
(similar in meaning)

This is all the clue.

(Other definitions for defiant that I've seen before include "Openly resistant" , "Unyielding" , "showing teeth!" , "Uncooperative" , "Boldly resistant -- fainted (anag)" .)

I've seen this clue in The Telegraph, The Independent and the Evening Standard.

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