Get rid of slight squint (4)
I believe the answer is:
cast
This clue is a double definition.
'get rid of' is the first definition.
(as in casting away)
'slight squint' is the second definition.
(cast can mean a slight squint)
(Other definitions for cast that I've seen before include "Squint to see" , "'Send forth, a spell perhaps (4)'" , "Get rid of" , "Select actors for play or film" , "Troupe" .)