According to some bus conductors, fares do so (6)

I believe the answer is:

please

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'do so' is the definition.
'please' can be an answer for 'do' (thesaurus). I am not sure about the 'so' bit.

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for please that I've seen before include "If you'd be so kind?" , "Make happy or glad" , "Make cheerful" , "See pal (anag) -- charm" , "if you don't mind" .)

I've seen this clue in the Evening Standard.

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