Crossword Genius

Three-sided figure (8)

Ross

I believe the answer is:

triangle

'three-sided figure' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for triangle that I've seen before include "Polygon, could be isosceles" , "kitchen item" , "Percussion instrument of geometric origin" , "Geometrical figure - musical instrument" , "diamond cut in half?" .)

I've seen this clue in The Mirror, The Guardian, The Sun, The Star Tribune, The Irish Times and The Times.
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