Crossword Genius

It shows wind direction (4)

Ross

I believe the answer is:

vane

'it shows wind direction' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for vane that I've seen before include "Part of a weathercock" , "The weather-cock sounds conceited" , "Fin attached to the tail of an arrow" , "Device that rotates to show the direction of the wind" , "Windmill sail in 30 across" .)

I've seen this clue in The Irish Times.
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