Property at Bourne End, say (6)
I believe the answer is:
estate
'property' is the definition.
(estate is a kind of property)
'at bourne end say' is the wordplay.
'at' is a charade indicator (letters next to each other).
'end' says to take the final letters.
'say' becomes 'state' ('state' can be a synonym of 'say'**).
The final letter of 'bourne' is 'e'.
'e' put next to 'state' is 'ESTATE'.
(Other definitions for estate that I've seen before include "House and grounds" , "Property with considerable land" , "Everything person possesses" , "Desmene" , "Industrial area" .)