Scowl when given a shiner? (6)
I believe the answer is:
glower
I believe this clue is a double definition.
'scowl' is the first definition.
(I've seen this before)
'a shiner?' is the second definition.
(I've seen this before)
'when given' acts as a link.
(Other definitions for glower that I've seen before include "burning ember, say?" , "Glare" , "Look black" , "Fierce look" , "Look hotly or angrily" .)