Rev's soap flakes for religious festival (8)

I believe the answer is:

passover

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

'religious festival' is the definition.
(I've seen this before)

'rev's soap flakes' is the wordplay.
'rev's soap' anagrams to 'PASSOVER'.
Though, I'm unsure how the anagram is indicated.

'for' is the link.

Can you help me to learn more?

(Other definitions for passover that I've seen before include "spring festival" , "feast - with 25a" , "religious festival" , "Disregard - Jewish festival" .)

I've seen this clue in the Sydney Morning Herald.

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