Location containing a large and stately mansion (6)
I believe the answer is:
palace
'stately mansion' is the definition.
(I've seen this before)
'location containing a' is the wordplay.
'location' becomes 'place' (a location is a place).
'containing' means one lot of letters goes inside another.
'place' placed around 'a' is 'PALACE'.
'large and' is the link.
This may not be correct. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for palace that I've seen before include "Locality round a monarch's official residence" , "See 16" , "imposing building" , "Royal house" , "Regal mansion" .)