Crossword Genius

On the verge of retirement? (5,3,3)

Ross

I believe the answer is:

ready for bed

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

'on' is the definition.
Both the definition and answer are adjectives.
Perhaps they are linked in a way I don't understand?

'verge of retirement?' is the wordplay.
I cannot quite see how this works, but
'of' could be 'o' and 'o' is located in the answer.
'retirement?' could be 'bed' and 'bed' is present in the answer.
This explanation may well be incorrect...

'the' is the link.

Can you help me to learn more?

I've seen this clue in The Globe and Mail.
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