Tasteful stuff from married relatives in excellent area (8)
I believe the answer is:
ambrosia
'tasteful stuff' is the definition.
(tasty food of the gods in Greek myth)
'married relatives in excellent area' is the wordplay.
'married' becomes 'm'.
'relatives' becomes 'bros' (bro is short for brother).
'in' is an insertion indicator.
'excellent' becomes 'ai' (resembles 'A1', old-fashioned term for excellent).
'area' becomes 'a' (maths abbreviation).
'm'+'bros'='mbros'
'mbros' inserted into 'ai' is 'ambrosi'.
'ambrosi'+'a'='AMBROSIA'
'from' acts as a link.
(Other definitions for ambrosia that I've seen before include "Food of the gods in Greek mythology" , "Wonderful food" , "Nectar of the gods" , "food from the deli?" , "Food of classical gods" .)