Possible Clues:

• Might the carp enter with this from a carol, by the sound of it?
• Sea beast with 6
• Sea-mammal
• Long moustache from Arctic amphibian
• Marine beast (with moustache)
• With 6 down he went down the Strand, but not to have a 9 across
• Arctic beast
• He and the carpenter are, in short, in the wrong law with us
• Aquatic creature Washington gets almost churlish about
• Tusked sea animal