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Religious festival - a way I assume irony? (5,3)

Ross

I believe the answer is:

feast day

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

'religious festival' is the definition.
'feast day' can be an answer for 'festival' (I've seen this before). I'm not certain of the 'religious' bit.

'a way i assume irony?' is the wordplay.
I cannot really understand how this works, but
'a' is present in the answer.
'way' could be 'st' (abbreviation for street) and 'st' is found in the answer.
'i' could be 'a' and 'a' is located in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for feast day that I've seen before include "Church holiday for eating and rejoicing - fed satay (anag)" , "time to celebrate" , "Religious celebration" , "festival" , "Annual Christian celebration" .)

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