Area within location for splendid house (6)
I believe the answer is:
palace
'splendid house' is the definition.
(I've seen this before)
'area within location' is the wordplay.
'area' becomes 'a' (maths abbreviation).
'within' indicates putting letters inside.
'location' becomes 'place' (place is a kind of location).
'a' going into 'place' is 'PALACE'.
'for' is the link.
(Other definitions for palace that I've seen before include "Royal residence" , "Grand building" , "Locality round a monarch's official residence" , "Head of state's residence" , "eg Buckingham" .)