Look backwards and forwards (3)
I believe the answer is:
eye
'look' is the definition.
(eyeing is a kind of looking)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for eye that I've seen before include "Ogle" , "Orb" , "Optical organ" , "central spot" , "Small loop or hole" .)