Oldies in state of uncertainty? Yes, possibly (6)

I believe the answer is:

fogeys

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'oldies' is the definition.
I can't judge whether this definition defines the answer.

'state of uncertainty? yes possibly' is the wordplay.
I cannot really see how this works, but
'state' could be 'fog' (fog is a kind of state) and 'fog' is located in the answer.
an anagram of 'yes' is 'eys' which is present in the answer.
No letters remain.
This may be the basis of the clue (or it may be nonsense).

'in' is the link.

Can you help me to learn more?

I've seen this clue in The Guardian.

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