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Rigorous (9)

Ross

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9

'rigorous' is the definition.
(I know that rigorous can be written as stringent)

This is all the clue.

(Other definitions for stringent that I've seen before include "Strict, rigorous" , "binding" , "Tight" , "Of rule, say strict and precise" , "Tough" .)

I've seen this clue in The Telegraph and the Sydney Morning Herald.
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