| BIVALVE | Name a mollusc having two shells hinged together (7) |
| UNIVALVE | Of a mollusc, having a shell composed of a single piece (8) |
| BIVALVES | Molluscs with two shells joined together (8) |
| ABALONE | Edible marine gastropod mollusc having an ear-shaped shell (7) |
| COCKLES | Sand-burrowing edible molluscs, having rounded shells with radiating ribs (7) |
| CHITONS | Marine molluscs having oval shell with overlapping plates (7) |
| 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) |
| 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) |
| OCTOPUS | A month to work on a mollusc (7) |
| OCTOPOD | Top Co. do get about and find a mollusc (7) |
| SQUID | Fast-moving cephalopod mollusc having a torpedo-shaped body (5) |
| COCKLE | Small, edible mollusc, having a rounded shell with radiating ribs (6) |
| GLADSTONEBAG | Piece of baggage comprising two equal-sized compartments hinged together |
| CALLIPERS | An instrument for measuring dimensions, consisting of two steel legs hinged together (9) |
| LIMPET | Gastropod mollusc having a conical shell which clings to rocks (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) |
| STEPLADDERS | Portable climbing aids that are made of two sloping parts hinged together at the top (11) |
| TRIPTYCH | Set of three panels hinged together (8) |
| SLUG | Terrestrial gastropod mollusc having an absent or reduced shell (4) |
| OFTHEHEART | Centrally placed molluscs having depths of feelings (7,2,3,5) |
