Ignore 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)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

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

I've seen this clue in The Sun.

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