Crossword Genius

Coaches a blockhead on operations (5)

Ross

I believe the answer is:

buses

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'coaches' is the definition.
('bus' can be a synonym of 'coach')

'a blockhead on operations' is the wordplay.
'a blockhead' becomes 'b' (head letter of 'block').
'on operations' becomes 'uses' (I can't explain this - if you can you should believe this answer much more).
'b'+'uses'='BUSES'

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(Other definitions for buses that I've seen before include "Passenger vehicles" , "Public service vehicles" , "Public transport vehicles" .)

I've seen this clue in the Evening Standard.
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