Leave Egypt's borders around eleven (4)
I believe the answer is:
exit
'leave' is the definition.
(I know that leave can be written as exit)
'egypt's borders around eleven' is the wordplay.
'borders' says to hollow out the word (remove centre letters) (only the edge or border letters remain).
'around' indicates putting letters inside.
'eleven' becomes 'xi' (Roman numerals).
'egypt' with its centre taken out is 'et'.
'et' enclosing 'xi' is 'EXIT'.
(Other definitions for exit that I've seen before include "Move out" , "Actor's departure" , "Relinquish the lead" , "Sudden rush of pleasure" , "Withdrawal" .)