Country lane winding around first of poplars (5)
I believe the answer is:
nepal
'country' is the definition.
(Nepal is an example)
'lane winding around first of poplars' is the wordplay.
'winding' indicates an anagram.
'around' means one lot of letters goes inside another.
'first of' suggests taking the first letters.
The first letter of 'poplars' is 'p'.
'lane' is an anagram of 'neal'.
'neal' going around 'p' is 'NEPAL'.
(Other definitions for nepal that I've seen before include "somewhere in the Himalayas" , "Himalayan republic" , "Himalayan country" , "Country in the Himalayas, capital Katmandu" , "Asian country -- plane (anag)" .)