Narrow defile left for entering another country (8)
I believe the answer is:
passport
'entering another country' is the definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.
'narrow defile left' is the wordplay.
'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' acts as a link.
Can you help me to learn more?
(Other definitions for passport that I've seen before include "one admits" , "Official document required for international travel" , "Document allowing travel abroad" , "is the open sesame" , "It could be important on holiday" .)