Crossword Genius

Revered creature that surprises me (4,3)

Ross

I believe the answer is:

holy cow

I'm a little stuck... Click here to teach me more about this clue!

'surprises me' is the definition.
I don't know anything about this answer so I can't tell whether this works.

'revered creature' is the wordplay.
'revered' becomes 'holy' (I am not sure about this - if you are sure you should believe this answer much more).
'creature' becomes 'cow' (cow is a kind of animal).
'holy'+'cow'='HOLY COW'

'that' is the link.

Can you help me to learn more?

(Other definitions for holy cow that I've seen before include "Blimey!" , "The goodness" .)

I've seen this clue in The Guardian.
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