Pass end of cables through walls (4)
I believe the answer is:
visa
'pass' is the definition.
(pass allowing international travel)
'end of cables through walls' is the wordplay.
'end of' says to take the final letters.
'through' becomes 'via' (via means going through).
'walls' indicates putting letters inside (to 'wall' can mean to contain).
The final letter of 'cables' is 's'.
's' put within 'via' is 'VISA'.
(Other definitions for visa that I've seen before include "Endorsement allowing bearer to enter country" , "Endorsement made in a passport" , "Passport stamp or well-known credit card" , "Travel pass" , "giving you access to capital?" .)