Object to test (9)

I believe the answer is:

challenge

I believe this is a double definition.

'object to' is the first definition.
(thesaurus)

'test' is the second definition.
(thesaurus)

(Other definitions for challenge that I've seen before include "Invitation to contest" , "Object to" , "Ask to take part in a contest" , "difficult feat" , "Invite to contest, throw down the gauntlet" .)

I've seen this clue in The Telegraph.

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