Garb for Superman (4)
I believe the answer is:
cape
'garb for superman' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for cape that I've seen before include "Headland - garment" , "Short sleeveless garment" , "Covering for the shoulders" , "Outer garment" , "Horn or Good Hope - cloak" .)