Designed for the altar? (8)
I believe the answer is:
intended
'designed' is the definition.
(thesaurus)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for intended that I've seen before include "Deliberate" , "Informally one's fiance or fiancee" , "Fiancee (colloq.)" , "no mistake!" , "Fiancé (e) - on purpose" .)