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Worried, I got nervier at questioning (13)

Ross

I believe the answer is:

interrogative

'questioning' is the definition.
(I've seen this before)

'worried i got nervier at' is the wordplay.
'worried' indicates anagramming the letters.
'i'+'got'+'nervier'+'at'='igotnervierat'
'igotnervierat' anagrammed gives 'INTERROGATIVE'.

(Other definitions for interrogative that I've seen before include "Denoting a question" , "raising questions" , "Questioning" .)

I've seen this clue in The Telegraph.
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