Untraditional playing for a start – that’s plain (6)
I believe the answer is:
tundra
'plain' is the definition.
(tundra is a kind of plain)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for tundra that I've seen before include "Cold northern region" , "where you might see caribou" , "Cold plain" , "Treeless frozen Arctic plain" , "Arctic region of permafrost" .)