Bread with some butter relations brought up after tea (8)
I believe the answer is:
chapatti
'bread' is the definition.
(chapatti is a kind of bread)
'butter relations brought up after tea' is the wordplay.
'butter' becomes 'pat' (a pat can mean a lump of butter).
'relations' becomes 'it' (both can mean sex).
'brought up' shows that the letters should be reversed in order (in a down clue, letters go up).
'after' means one lot of letters go next to another.
'tea' becomes 'cha' (cha is a type of tea).
'it' back-to-front is 'ti'.
'pat'+'ti'='patti'
'patti' after 'cha' is 'CHAPATTI'.
'with some' is the link.
(Other definitions for chapatti that I've seen before include "Feature of Indian cuisine" , "Indian pancake of unleavened wholemeal bread" , "food" , "Flat pancake-like Indian bread" .)