| SEXTANT | Navigational instrument, or a sixth part of a circle (7) |
| OBOL | A sixth part of a drachma in weight or in money, in ancient Greece (4) |
| SEGMENT | From the Latin for "to cut", each of several parts into which something, such as an arthropod/insect, orange or population, is or may be divided; or, part of a circle that is cut by its chord (7) |
| COMPASS | Navigational instrument traditionally with a fleur-de-lis marking north, depicted on the logo of Navstar Global Positioning System (7) |
| REGISTER | Range of a voice or instrument; or, a record of attendance, list of names, or a book of such entries (8) |
| CONCAVE | Like part of a circle |
| RANGE | A selection from which to choose; or, the full compass, gamut or scope of something, such as a musical instrument or a person's abilities, knowledge, vision or voice (5) |
| DRUM | A tympanum, either in the form of a percussion instrument or a vibrative part of the middle ear (4) |
| DEGREE | 360th part of a circle's circumference; an academic qualification held by a Bachelor of Arts or of Science, for example; or, 60 geographical miles (6) |
| TRIANGLE | In the shape of a three-sided polygon, a percussion instrument; or, a frame for snooker balls (8) |
| SONATA | Type of musical composition, usually for a solo instrument or a small instrumental ensemble (6) |
| CONTRA | Informally, a symphony orchestra's lowest woodwind instrument, or a Nicaraguan guerrilla fighter |
| BASS | Name of an instrument or a fish |
| TENDERISER | A pounding instrument or a substance that softens meat (10) |
| ARCTIC | Circle is part of a circle with a twitch (6) |
| SECTOR | Religious sub-group or a part of a circle (6) |
| OCTANT | Word for a half-quadrant or an eighth part of a circle (6) |
| VIOLA | Instrument; or, a pansy-like flower (5) |
| GONG | Percussion instrument, or a medal (4) |
| FLUTE | Wind instrument or a loud stringed one (5) |
