Garment for groom? (5)
I believe the answer is:
dress
I believe this clue is a double definition.
'garment' is the first definition.
(I know that garment can be written as dress)
'for groom?' is the second definition.
(dressing is a kind of grooming)
(Other definitions for dress that I've seen before include "This woman might slip on" , "clean > bandage" , "Adorn" , "Straighten the line" , "Uniform" .)