Spoken, verbal (4)
I believe the answer is:
oral
I believe this clue is a double definition.
'spoken' is the first definition.
(similar in meaning)
'verbal' is the second definition.
(I've seen this in another clue)
(Other definitions for oral that I've seen before include "Viva voce" , "Spoken rather than written" , "Unwritten examination" , "Via the mouth" , "Like some tradition" .)