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 Irish Times, the Universal, the USA Today, The Mirror, the Newsday, The Telegraph, The Times, The Independent, The Daily Mail and the Evening Standard.

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