Party member goes to railway (4)

I believe the answer is:

tory

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'party member' is the definition.
(thesaurus)

'to railway' is the wordplay.
'railway' becomes 'ry' (abbreviation for railway).
'to'+'ry'='TORY'

'goes' acts as a link.
This may not be right. It may belong to another bit of the clue.

Can you help me to learn more?

(Other definitions for tory that I've seen before include "Opponent of 8 Down and 14 Across, partner of 14 Down?" , "Traditionalist" , "English Conservative politician or Donegal island" , "blue" , "type on right? Yes" .)

I've seen this clue in the Sydney Morning Herald.

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