Crossword Genius

Endless source of nourishment (5)

Ross

I believe the answer is:

bagel

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

'nourishment' is the definition.
(bagel is a kind of nourishment)

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

Can you help me to learn more?

(Other definitions for bagel that I've seen before include "It's edible" , "Ring-shaped bread roll" , "Doughnut-shaped bread roll" , "Toroidal bread roll" , "round fare" .)

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