Old Roman Catholic: an ogre (3)

I believe the answer is:

orc

'an ogre' is the definition.

'old roman catholic' is the wordplay.
'old' becomes 'o' (common abbreviation eg in OE for Old English).
'roman catholic' becomes 'rc' ('r.c.' can be a synonym of 'roman catholic').
'o'+'rc'='ORC'

(Other definitions for orc that I've seen before include "Tolkienian creature" , "Imaginary creature" , "Sea-monster" , "Ugly creature" , "Fierce goblin" .)

I've seen this clue in The Times.

Want a hint initially instead of a full solution? Install my app