Should (5)

I think it could be either:

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5,2

ought

'should' is the definition.
(synonyms)

This is the entire clue.

(Other definitions for ought that I've seen before include "Tough (anag)" , "Have/has a duty (to do)" , "It expresses duty or obligation" , "outdated anything at all?" , "Be bound" .)

I've seen this clue in the Penny Press, the Sydney Morning Herald, The Guardian, the Evening Standard and The Telegraph.

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