Boy’s inspired idea — to visit Santa here? (7)
I believe the answer is:
lapland
'visit santa here?' is the definition.
'boy's inspired idea' is the wordplay.
'boy' becomes 'lad' (informal term for boy).
'inspired' is an insertion indicator (inserted letters get breathed in or 'inspired').
'idea' becomes 'plan' (plan is a kind of idea).
'lad' enclosing 'plan' is 'LAPLAND'.
'to' is the link.
(Other definitions for lapland that I've seen before include "Santa's location other than at Christmas?" , "Region of northern Europe" , "Region at the north of Scandinavia - Santa lives there" , "North Scandinavian region associated with Santa Claus" , "Father Christmas's home?" .)