Haw's partner (3)
I believe the answer is:
hem
'haw's partner' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for hem that I've seen before include "Part of skirt" , "Finished edge of a piece of cloth" , "Bottom of a garment" , "Double-backed cloth border" , "A stitched border of cloth" .)