Voiced (5)
(Other definitions for spoke that I've seen before include "Said something" , "addressed" , "Radius" , "Rung" , "gave a lecture" .)
'voiced' is the definition.
(similar in meaning)
This is all the clue.
(Other definitions for vocal that I've seen before include "Relating to the human voice" , "singing" , "(Performance of) piece that is sung" , "speaking loudly" , "Audible in protest" .)