Don’t leave shore (4)
I believe the answer is:
stay
I believe this is a double definition.
'don't leave' is the first definition.
(I've seen this in another clue)
'shore' is the second definition.
(thesaurus)
(Other definitions for stay that I've seen before include "Visit (for the night)" , "Remain behind" , "Temporary residence" , "control" , "Supporting rope; remain" .)