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Delicious food? Routine some say (5)

Ross

I believe the answer is:

manna

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'delicious food?' is the definition.
(I've seen this before)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for manna that I've seen before include "Heavenly food" , "miraculously sustaining food" , "Food provided by God for the Israelites in the wilderness" , "Free food (from heaven)" , "Miraculous food from Heaven" .)

I've seen this clue in The Times and The Sunday Times.
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