Crossword Genius

Coach pal to make final beginning of September (3)

Ross

I believe the answer is:

bus

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'coach' is the definition.
(synonyms)

I cannot understand how the remainder of the clue works.

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(Other definitions for bus that I've seen before include "Use transport" , "Motor-coach" , "Coach" , "Something caught" , "Large passenger vehicle - small business!" .)

I've seen this clue in The Independent.
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