Currently employed -- success impossible here? (2-3,9)

I believe the answer is:

no-win situation

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

'currently employed success' is the definition.
The definition suggests a singular noun which matches the answer.

'impossible here?' is the wordplay.
I cannot quite see how this works, but
'impossible' could be 'nowin' (I've seen this in another clue) and 'nowin' is found within the answer.
The remaining letters 'situation' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

I've seen this clue in The Telegraph.

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