Judge's garment (4)
I believe the answer is:
robe
'judge's garment' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for robe that I've seen before include "Ceremonial garment, clothe" , "Long loose garment or dressing gown" , "judge's garment" , "Dressing-gown" , "Formal gown" .)