Crossword Genius

"Measure" has one R in it (4)

Ross

I believe the answer is:

acre

'measure' is the definition.
(acre is a kind of measure)

'one r in it' is the wordplay.
'one' becomes 'ace' ('ace' can be a synonym of 'one').
'in it' indicates putting letters inside.
'ace' placed around 'r' is 'ACRE'.

'has' acts as a link.

(Other definitions for acre that I've seen before include "holy city" , "Middle East port" , "A state of W Brazil" , "Levant sea port" , "Unit of land area" .)

I've seen this clue in The Telegraph.
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