Losing sides abuse coach (3)

I believe the answer is:

bus

I'm a little stuck... Click here to teach me more about this clue!

'coach' is the definition.
(synonyms)

'losing sides abuse' is the wordplay.
'BUS' is hidden within the letters.
But, I am unsure how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for bus that I've seen before include "Public service vehicle" , "Charabanc" , "Use transport" , "Of projectiles; (go) mad (slang)" , "Coach" .)

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

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