Grumpy companion (6)
I believe the answer is:
sneezy
'grumpy companion' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for sneezy that I've seen before include "One of the Seven Dwarfs" , "Doc's pal with hay fever" , "Sternutatory dwarf" , "Showing signs of a cold" , "Disney dwarf - with a cold?" .)