Tangy starters of tomato and Roquefort tortellini (4)
I believe the answer is:
tart
'tangy' is the definition.
('tart' can be a synonym of 'tangy')
'starters of tomato and roquefort tortellini' is the wordplay.
'starters of' says to take the initial letters.
The initial letters of 'tomato and roquefort tortellini' is 'TART'.
(Other definitions for tart that I've seen before include "Pie with fruit filling" , "Sour -- acid" , "perhaps rather sharp" , "Open cake with jam etc" , "A bit sour, like flattish pie" .)