What you pay to get on? (4)

I believe the answer is:

fare

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'get on?' is the definition.
(thesaurus)

I can't explain the remainder of the clue.

(Other definitions for fare that I've seen before include "diet" , "Cost of travel" , "Get on - passenger - provisions" , "Charge for travelling on train or bus" , "Transport charge" .)

I've seen this clue in the Evening Standard.

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