Answer given by Roman Catholic in Bow (3)
I believe the answer is:
arc
'bow' is the definition.
(both can mean a curve)
'answer given by roman catholic' is the wordplay.
'answer' becomes 'a' (abbreviation eg in Q and A).
'given by' means one lot of letters go next to another.
'roman catholic' becomes 'RC' (abbreviation for Roman Catholic).
'a'+'rc'='ARC'
'in' acts as a link.
(Other definitions for arc that I've seen before include "development of plot" , "Part of a circular line" , "A curve; a discharge" , "Curved section" , "Crescent" .)