Answer:

HOLY

Answer	Crossword Clue
HOLY	Mackerel starter
HOLY	Divine
HOLY	Sacred

HOLY	.. Cross
HOLY	Sort of mackerel?
HOLY	Sort of roller?
HOLY	Sacrosanct
HOLY	Suitable for the canon
HOLY	Word in many carol titles
HOLY	Worthy of worship
HOLY	Worthy of reverence

HOLY	Devout
HOLY	Sanctified
HOLY	Blessed
HOLY	Fit for sainthood
HOLY	Word with cats or cow
HOLY	First word from Robin
HOLY	Consecrated
HOLY	Religious

HOLY	Grail descriptor
HOLY	Like mackerel and cats?
HOLY	... Joe (military chaplain)
HOLY	... See (Pope's domain)
HOLY	Of interest to the Pope
HOLY	Third word of "Silent Night"
HOLY	... Cross
HOLY	"... moly!"

HOLY	Like Toledo?
HOLY	Like some cats and mackerel?
HOLY	"... cow!"
HOLY	Start of many exclamations
HOLY	Like a Thursday before Easter
HOLY	Like the Bible and the Koran
HOLY	Saintly
HOLY	....mackerel!

HOLY	".... cow!"
HOLY	Part of HRE
HOLY	Cow lead-in?
HOLY	Devoted to the church
HOLY	".. cow!"