Old magistrate briefly brought up wind (4)
I believe the answer is:
veer
'wind' is the definition.
(thesaurus)
'old magistrate briefly brought up' is the wordplay.
'old magistrate' becomes 'reeve' (I've seen this before).
'briefly' means to remove the last letter.
'brought up' says the letters should be written in reverse (down clues only).
'reeve' with its last letter removed is 'reev'.
'reev' reversed gives 'VEER'.
(Other definitions for veer that I've seen before include "Change direction sharply" , "Change direction abruptly" , "Swing around" , "Swerve" , "Deviate" .)