Measuring stick (5)

I think it could be either:

ruler

gauge

'measuring stick' is the definition.
(ruler is a kind of measuring stick)

This is all the clue.

(Other definitions for ruler that I've seen before include "Person in authority" , "Straight edge; monarch" , "Person in charge of country" , "Potentate" , "Stationery item" .)

I've seen this clue in the Evening Standard, The Mirror, the USA Today, the Universal, The Irish Times, The Independent, the Newsday, The Daily Mail, The Times and The Telegraph.

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