| CLAM | A mollusc in secret |
| OYSTER | Mollusc in a class that includes clams, cockles, mussels and scallops, traditionally served shucked on a bed of ice with mignonette sauce (6) |
| RASP | A grating sound; a scrape of a door; a coarse file; a mollusc's tongue; or, a berry synonymous with a boo (4) |
| GIANTSNAIL | Huge mollusc in a lasting setting (5,5) |
| COCKLE | From the French for "shell", a mollusc with heart-shaped shucks; black tourmaline; a furnace, oast or stove; a little boat; or, a codename for a kayak in the Second World War (6) |
| NACARAT | Word, thought to be referring to a colour of the shell of a mollusc that yields mother-of-pearl, for a shade of orangey-red or "sunset"; or, a fabric/linen dyed in such a hue (7) |
| SCUTTLE | Small mollusc in sink (7) |
| HEARTSHELL | Mollusc in centre's something dire |
| ORMER | Edible, ear-shaped mollusc ... in wormery (5) |
| OCTOPUS | Blue-ringed -, mollusc in box F (7) |
| CLAMP | Word related to the name of a mollusc for a mechanical vice that also means a heap of root vegetables; a stack of bricks; or, a car immobiliser (5) |
| SEASLUG | Mollusc in sample case has lost head and ear (3,4) |
| SLUG | Terrestrial gastropod mollusc in which the shell is absent or reduced (4) |
| OYSTERS | Molluscs in a class/group that includes clams, cockles, mussels and scallops (7) |
| NAUTILI | Molluscs in the sea until a pollution, I understand |
| SNAIL | Synonymous with the conventional postal system or anything slow-moving, a mollusc with a house in the form of a whorled shell which it carries on its back (5) |
| MANTLE | Word for a cloak or shawl, hence a blanket, coating of snow, layer of the Earth, pallium of a mollusc, tapestry, wing covert of a bird or other covering/concealing thing (6) |
| SCALLOP | A mollusc with a fan-shaped shell; one of its valves, as a pilgrim's badge; or, a little dish, potato fritter or wavy edge, like said fluted shell (7) |
| NAIL | Scots word for a framboise; a mollusc's tongue; the stridulator of a cricket; or, a file for blacksmithing (4) |
| RIBBON | A taenia of satin or silk etc with which to make a cockade, fillet or rosette; or, something strip-like, such as a band-saw or a mollusc's radula (6) |
