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Three-quarters of those in 17 down working in a station (6)

Ross

I believe the answer is:

porter

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

'three-quarters of those in 17 down working' is the definition.
I can't judge whether this definition defines the answer.

'in a station' is the wordplay.
'in' indicates putting letters inside.
'a' becomes 'per'.
'station' becomes 'ort' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'per' enclosing 'ort' is 'PORTER'.

Can you help me to learn more?

(Other definitions for porter that I've seen before include "Hotel luggage carrier" , "Doorkeeper; dark beer" , "Hotel bag-carrier or dark beer" , "One carries luggage" , "Hospital worker; beer" .)

I've seen this clue in the Irish Times.
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