Incidentally, reporter should pay for the course (2,3,3)

I believe the answer is:

by the way

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'incidentally' is the definition.
(I know that incidentally can be written as by the way)

I can't explain the remainder of the clue.

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(Other definitions for by the way that I've seen before include "Where to find kerbstones" , "At the roadside - incidentally" , "Where 14's [HARD SHOULDER] situated" , "At the side of the path?" , "In point of fact" .)

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

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