Church in Arabian republic out of bounds for host (5)
I believe the answer is:
emcee
'for host' is the definition.
(synonyms)
'church in arabian republic out of bounds' is the wordplay.
'church' becomes 'CE' (abbreviation for Church of England).
'in' means one lot of letters goes inside another.
'arabian republic' becomes 'yemen' (I've seen this in another clue).
'out of bounds' indicates the central letters (the bounds or edges of the word are removed).
The central letters of 'yemen' are 'eme'.
'ce' going inside 'eme' is 'EMCEE'.
(Other definitions for emcee that I've seen before include "Compere" , "anchor" , "One presents" , "One presiding over an event" , "show director" .)