Gross, coarse (5)
I believe the answer is:
crass
This clue is a double definition.
'gross' is the first definition.
(I've seen this before)
'coarse' is the second definition.
(I've seen this in another clue)
(Other definitions for crass that I've seen before include "Totally lacking in sensibility" , "Insensitively stupid" , "Indelicate" , "Asinine" , "Coarse" .)