Boy accepts scheme in northern region (7)
I believe the answer is:
lapland
'northern region' is the definition.
(I've seen this in another clue)
'boy accepts scheme' is the wordplay.
'boy' becomes 'lad' (informal term for boy).
'accepts' means one lot of letters goes inside another.
'scheme' becomes 'plan' (synonyms).
'lad' enclosing 'plan' is 'LAPLAND'.
'in' acts as a link.
(Other definitions for lapland that I've seen before include "Region of northern Europe" , "North Scandinavian region associated with Santa Claus" , "Region of N. Europe" , "Arctic region" , "Father Christmas's home?" .)