Teas brewed behind (4)
I believe the answer is:
seat
'behind' is the definition.
('seat' can be a synonym of 'behind')
'teas brewed' is the wordplay.
'brewed' is an anagram indicator.
'teas' anagrammed gives 'SEAT'.
(Other definitions for seat that I've seen before include "MP's place in parliament" , "Take one and sit" , "Behind" , "MP's constituency" , "Somewhere to sit" .)