Plane flies around mountainous country (5)
I believe the answer is:
nepal
'mountainous country' is the definition.
(I've seen this before)
'plane flies' is the wordplay.
'flies' indicates an anagram.
'plane' anagrammed gives 'NEPAL'.
'around' is the link.
(Other definitions for nepal that I've seen before include "Himalayan state" , "Country located mainly in the Himalayas" , "Gurkhas' homeland" , "mountainous region" , "Himalayan country" .)