One may be seen in a rugged cove, say (5)
I believe the answer is:
voice
'say' is the definition.
(I know that voice is a more specific form of the action say)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for voice that I've seen before include "Sound with which one speaks" , "Articulate" , "Sound produced in the larynx" , "tenor, say" , "Spokesperson" .)