Timers used fairly as basis for judgement (6)

I believe the answer is:

merits

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'fairly as basis for judgement' is the definition.
I can't tell whether this definition defines the answer.

'timers used' is the wordplay.
'used' indicates an anagram.
'timers' anagrammed gives 'MERITS'.

Can you help me to learn more?

(Other definitions for merits that I've seen before include "Virtues of timers" , "Deserves or warrants" , "Deserves, is worthy of" , "Deserves to be praised" , "Legally right or wrong" .)

I've seen this clue in the Evening Standard.

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