Crossword Genius

By word of mouth, round racing event (6)

Ross

I believe the answer is:

orally

'by word of mouth' is the definition.
(I've seen this before)

'round racing event' is the wordplay.
'round' becomes 'o' (o is a circular letter).
'racing event' becomes 'rally'.
'o'+'rally'='ORALLY'

(Other definitions for orally that I've seen before include "How anyone would speak" , "given drugs thus?" , "By spoken word" , "How one speaks" , "via the trap" .)

I've seen this clue in The Mirror.
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