Crossword Genius

Meal which can take an eon (5)

Ross

I believe the answer is:

lunch

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

'meal' is the definition.
(I know that lunch is a type of meal)

I don't understand the rest of the clue.

Can you help me to learn more?

(Another definition for lunch that I've seen is " Midday meal".)

I've seen this clue in The Irish Independent.
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