Expensive address (4)
I believe the answer is:
dear
I believe this is a double definition.
'expensive' is the first definition.
(similar in meaning)
'address' is the second definition.
(I've seen this before)
(Other definitions for dear that I've seen before include "Needing plenty of bread" , "Expensive; sweet" , "Costly (but loved!)" , "address for partner" , "It's not cheap" .)