Relating to wings (4)

I believe the answer is:

alar

'relating to wings' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for alar that I've seen before include "using such appendages to fly?" , "Resembling a wing" , "crop retardant" , "Related to wings" , "Relating to wings" .)

I've seen this clue in the USA Today and The Times.

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