With a guilty look (7)
I believe the answer is:
hangdog
'with a guilty look' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for hangdog that I've seen before include "Appearing ashamed" , "Shamefaced like suspended canine?" , "Apparently embarrassed" , "Shamed (expression)" , "Shamefaced (expression)" .)