| OCELLI | The eyes which have a single lens. |
| FLIES | Insects which have a single pair of transparent wings (5) |
| EYES | Crickets have five ___. Two compound eyes which have various lenses which also help to protect them from predators and three simple eyes which help them to distinguish between light and dark. |
| MONOCLE | A single lens for one eye, as in the kimono clematis! (7) |
| CAMERA | A single-lens reflex, for example (6) |
| EYEGLASS | A single lens for assisting defective sight (8) |
| LENS | A transparent biconvex body in the eye which focuses upon the retina light rays entering the pupil / piece of transparent substance used in optical instruments to form an image |
| IRIS | Flash's girlfriend or part of the eye which controls the size of pupil |
| NEEDLE | May be jabbed in the eye, which does irritate (6) |
| ABEYANCE | Sailor gets thrown can in the eye which puts him out of action (8) |
| UNICORNS | Which mythological animals have a single long horn (8) |
| CARE | A happy-go-lucky person doesn't have a single one |
| ASHBY | Pelargonium '___' the deep-pink blooms of which have a crimson centre (5) |
| BORAGE | Plant with star-shaped blue flowers, the young leaves of which have a cucumber-like flavour (6) |
| MALLARDS | Large ducks, the males of which have a green head and yellow bill (8) |
| OPERON | Open or unravel a cluster of genes which have a common promoter (6) |
| SNIPES | Wading birds of the genus Gallinago and related genera which have a long straight bill (6) |
| STOATS | Mammals of the weasel family which have a white coat in winter (6) |
| SNOWCHAINS | Vices (including, today, tea) which have a grip (4,6) |
| ZEBU | Domesticated cattle of South Asia which have a shoulder hump (4) |
