After setback, I'll bandage left eye up (4)
I believe the answer is:
ogle
'eye up' is the definition.
(I've seen this before)
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for ogle that I've seen before include "Eye lecherously" , "Gawp" , "Eye lewdly" , "Look with desire" , "Close scrutiny" .)