Possible Clues:

• Sin with us to make them
• Some subterranean travel in natural hollows
• Sounds as if one knows they're near to the insect artist
• Natural cavities in bone; ratan (anag.)
• Bone cavities in human trapezia
• With an inversion of painting one knows where they are, by the sound of them
• An upturned craft up your nose
• Bodily cavities revealed in course of organ transplant
• Cavities cause some constant, raging toothache
• The hollows one knows there of antrim, by the sound of them