Bishop organised church meal (6)
I believe the answer is:
brunch
'meal' is the definition.
(brunch is a kind of meal)
'bishop organised church' is the wordplay.
'bishop' becomes 'b' (abbreviation used in chess).
'organised' becomes 'run' ().
'church' becomes 'ch' (common abbreviation).
'b'+'run'+'ch'='BRUNCH'
(Other definitions for brunch that I've seen before include "Meal taken before noon, perhaps" , "Two meals in one" , "11am meal?" , "Late-morning meal" , "Late breakfast, or early lunch" .)