Island I love (northern area) (4)
I believe the answer is:
iona
'island' is the definition.
(I've seen this before)
'i love northern area' is the wordplay.
'love' becomes 'o' (In tennis, 'love' means 'zero').
'northern' becomes 'n' (abbreviation e.g. N. Ireland).
'area' becomes 'a' (maths abbreviation).
'i'+'o'+'n'+'a'='IONA'
(Other definitions for iona that I've seen before include "small island" , "Hebridean island famed for St Columba" , "Isolated part of UK" , "Greek sea god" , "place in the Hebrides" .)