The bairn evidently has wind (3)
I believe the answer is:
air
'wind' is the definition.
(air is a kind of wind)
'the bairn evidently has' is the wordplay.
'has' says the answer is hidden in the clue.
'AIR' is hidden within 'bairn evidently'.
(Other definitions for air that I've seen before include "show" , "If it's hot, it's boastful" , "Skye Boat Song, perhaps" , "Ventilate, say grievance" , "Broadcast; express" .)