| ROYGBIV | Mnemonic for rainbow colours |
| MNEMONICDEVICES | ROYGBIV for rainbow colors and HOMES for Great Lakes, e. g. |
| TRIG | SOHCAHTOA is a mnemonic for its ratios |
| RMONTH | Traditional mnemonic for when oysters are in season |
| EVERY | Part of the mnemonic for EGBDF |
| NEVEREATSHREDDEDWHEAT | Mnemonic for the cardinal directions |
| HOMES | Mnemonic for the Great Lakes |
| OPAL | Forming around hot springs, unique for its play of rainbow colours and found in art deco jewellery, the national gemstone of Australia (4) |
| OPALINE | Milk glass; or, pertaining to a gem with a unique play of rainbow colours, a word for nacreous, iridescent, pearly, polychromatic or prismatic (7) |
| IRIDESCENT | Shimmering with rainbow colours (10) |
| OPALESCENCE | A milky play of rainbow colours |
| SPECTRUM | Band of rainbow colours (8) |
| IRIDESCENCE | Rainbow colours caused by interference |
| PRISM | Crystal shaped to disperse light in rainbow colours |
| NEEDLE | French teacher's mnemonic for masculine nouns? A fine pointer (6) |
| TREBLECLEF | The first words of the answers to starred clues are a mnemonic for this musical symbol's staff lines |
| EASYTOREMEMBER | Emma Roberts may eye up mnemonic, for example (4,2,8) |
| SEDGES | "___ have edges" (rhyming mnemonic for identifying certain swamp plants) |
| TROUT | Drive off behind Turkish leader for rainbow (5) |
| RAPID | A first for Rainbow - Bungle paid Zippy (5) |
