North country area includes very serene place (7)
I believe the answer is:
nirvana
'serene place' is the definition.
(I've seen this before)
'north country area includes very' is the wordplay.
'north' becomes 'N' (abbreviation).
'country' becomes 'iran' (Iran is a country).
'area' becomes 'a' (maths abbreviation).
'includes' means one lot of letters goes inside another.
'very' becomes 'v' (common abbreviation).
'iran'+'a'='irana'
'irana' enclosing 'v' is 'irvana'.
'n'+'irvana'='NIRVANA'
(Other definitions for nirvana that I've seen before include "State of perfect happiness" , "Buddhist paradise or hereafter" , "Ultimate tranquil state" , "Kurt Cobain's grunge band" , "Buddhist heaven" .)