Cost of travelling coach sounds reasonable (5,4)

I believe the answer is:

train fare

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'cost of travelling' is the definition.
'train fare' can be an answer for 'cost' (train fare is a kind of cost). I'm not certain of the 'of travelling' bit.

'coach sounds reasonable' is the wordplay.
'coach' becomes 'train' (both can mean to instruct a sportsperson).
'sounds' shows a homophone (sound like).
'reasonable' becomes 'fair' (synonyms).
'fair' sounds like 'fare'.
'train'+'fare'='TRAIN FARE'

Can you help me to learn more?

(Other definitions for train fare that I've seen before include "Perhaps commute cost" , "the cost of going" .)

I've seen this clue in The Guardian.

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