An orange in one's tummy (5)

I believe the answer is:

navel

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

'an orange' is the definition.
(navel orange is a kind of orange)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for navel that I've seen before include "Target of gaze" , "Bellybutton" , "for contemplation" , "Something to contemplate" , "regarded with complacency" .)

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