Fortune left to part of church (7)
I believe the answer is:
chancel
'part of church' is the definition.
('chancel' is part of 'church')
'fortune left' is the wordplay.
'fortune' becomes 'chance' ('chance' can be a synonym of 'fortune').
'left' becomes 'l' (common abbreviation).
'chance'+'l'='CHANCEL'
'to' acts as a link.
(Other definitions for chancel that I've seen before include "Clergy's area of the church" , "choir and clergy's area" , "Area around the altar of a church" , "where choir sits" , "Place of altar" .)