Not afraid to speak up (5)
I believe the answer is:
vocal
'not afraid to speak up' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for vocal that I've seen before include "Relating to the human voice" , "Articulate" , "not instrumental" , "Outspoken (e.g. criticism)" , "(Performance of) piece that is sung" .)