Possible Clues:

• Hidden by; bottom
• By the sound of it, it's not for to be dear, by the sound of it
• See 33-Across
• This might be only for one buck, not be four, by the sound of it
• Astern
• With 71-Down, in secret
• Back there it might be sounding dear
• Back what might be the start of the back of 14 across
• Sounds as if there won't be four back here
• Live animal farther back