Throws back an image (8)
I believe the answer is:
reflects
'throws back an image' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for reflects that I've seen before include "Mirrors or ponders" , "'Contemplates, considers (8)'" , "Thinks deeply like mirror?" , "Mirrors or meditates" , "Sends back, light say" .)