Possibly ring place to review irrelevant installation (5)

I believe the answer is:

navel

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'possibly ring' is the definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.

'place to review irrelevant installation' is the wordplay.
'NAVEL' is hidden backwards in amongst the letters.
But, I'm not sure how this is indicated.

Can you help me to learn more?

(Other definitions for navel that I've seen before include "Variety of orange" , "Tummy button" , "Umbilicus" , "Bellybutton" , "Belly button" .)

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

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