Crossword Genius

Fake coach has to go back (5)

Ross

I believe the answer is:

bogus

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'fake' is the definition.
(I know that fake can be written as bogus)

'coach has to go back' is the wordplay.
'coach' becomes 'bus' (synonyms).
'has' indicates putting letters inside.
'to go back' becomes 'og' (I can't explain this - if you can you should believe this answer much more).
'bus' going around 'og' is 'BOGUS'.

Can you help me to learn more?

(Other definitions for bogus that I've seen before include "Pretended" , "Spurious" , "Mock" , "that's not real" , "Fictitious" .)

I've seen this clue in The Mirror.
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