Church notice in African republic (4)
I believe the answer is:
chad
'african republic' is the definition.
(I've seen this in another clue)
'church notice' is the wordplay.
'church' becomes 'ch' (common abbreviation).
'notice' becomes 'ad' (short for advert).
'ch'+'ad'='CHAD'
'in' is the link.
(Other definitions for chad that I've seen before include "Piece of (almost?) punched-out paper" , "N.Central African Republic" , "cartoon character" , "North central African country, capital N'Djamena" , "African country south of Libya" .)