A narrow defile left for getting from one country to another (8)
I believe the answer is:
passport
'getting from one country to another' is the definition.
I can't judge whether this defines the answer.
'a narrow defile left' is the wordplay.
'a narrow defile' becomes 'pass' (a defile is a type of gorge or path).
'left' becomes 'port' (left side of a ship - opposite of starboard).
'pass'+'port'='PASSPORT'
'for' is the link.
Can you help me to learn more?
(Other definitions for passport that I've seen before include "the key to success?" , "Official document required for international travel" , "papers" , "This ensures admission" , "Carte blanche" .)