A national organisation associated with one cold region or another (9)
I believe the answer is:
antarctic
'another' is the definition.
Both the answer and definition are adjectives. Maybe there's an association between them I don't understand?
'a national organisation associated with one cold region' is the wordplay.
'national organisation' becomes 'NT' (National Trust).
'associated with' is a charade indicator (letters next to each other).
'one cold region' becomes 'arctic' (the Arctic is a cold region).
'a'+'nt'+'arctic'='ANTARCTIC'
'or' is the link.
Can you help me to learn more?
(Other definitions for antarctic that I've seen before include "Where to pick up a penguin?" , "Relating to southern polar region" , "Relating to S. Pole region" , "Penguin's home" , "Region around the south pole" .)