Possible Clues:

• Sounds as if that was what I was doing
• Gee's up around in sight
• I will sound doing this
• Going with
• Be vocal about a couple of notes in sight
• It sounds as if I might have a vision of this
• Considering viewing
• Observing - understanding
• That's what I would be for, by the sound of it (6)
• In view of this, how to sing about the sound of 13 across (6)