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Tolerance, with Cobalt correctly counterbalanced (9)

Ross

I believe the answer is:

endurance

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'tolerance' is the definition.
(thesaurus)

I don't understand the rest of the clue.

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(Other definitions for endurance that I've seen before include "Stoical attitude" , "Shackleton took to the Antarctic" , "Lasting nature" , "Bearing" , "Polar ship" .)

I've seen this clue in The Hindu.
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