I'm over the hill and a stalemate results (7)

I believe the answer is:

impasse

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'and a stalemate results' is the definition.
I can't judge whether this definition defines the answer.

'i'm over the hill' is the wordplay.
'over the hill' becomes 'passe' (I've seen this in another clue).
'im'+'passe'='IMPASSE'

Can you help me to learn more?

(Other definitions for impasse that I've seen before include "Deadlock or stand-off" , "cul-de-sac" , "Dead end" , "Standstill" , "There's no way past it" .)

I've seen this clue in The Irish Independent.

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