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Sport in European cellar (4,5)

Ross

I believe the answer is:

pole vault

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

'sport' is the definition.
Although both the answer and definition are singular nouns, I don't understand how they can define each other.

'european cellar' is the wordplay.
'european' becomes 'pole' (someone from Poland).
'cellar' becomes 'vault' (I've seen this before).
'pole'+'vault'='POLE-VAULT'

'in' acts as a link.

Can you help me to learn more?

(Other definitions for pole vault that I've seen before include "Olympic field event" , "High-flying Olympic event" , "Athletic event" , "Field event -- value plot (anag)" , "Sergey Bubka was world champion at this event" .)

I've seen this clue in The Daily Express and The Mirror.
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