| DUMBBELLS | They develop the muscles of stupid, pretty girls, we hear (4-5) |
| BLUEBELL | Sad but pretty girl, we hear, one of many in the wood (8) |
| DUMB | Pretty stupid girls, we hear, are a feature of the gymnasium (4-5) |
| BELLS | Pretty stupid girls, we hear, are a feature of the gymnasium (4-5) |
| POLYANTHUS | Flower girls we hear this way |
| BELLAS | Beautiful girls we may ring, we hear (6) |
| ADDUCTORS | The three powerful muscles of the human thigh, in other words (9) |
| TRAPEZIUS | Either of two muscles of shoulder and upper back (9) |
| FISHFARMS | Develops the bass - and more - in places with intensive schooling? (4,5) |
| DRONEBEES | They develop from unfertilized eggs |
| MANHATTAN | - Project, WWII programme to develop the atomic bomb (9) |
| ELLINGTON | Jazz pianist and composer who helped develop the big band style |
| EUTHENICS | Study to improve living conditions and develop the US? Nice! (9) |
| CREMASTER | A muscle of the spermatic cord or a hook-like projection on butterflies' pupae (9) |
| QUICKSAND | "Clever" ahead of "stupid" initially, with sucker (9) |
| MIDSUMMER | Return of stupid arithmetician, say, in warm period |
| SARTORIAL | Relating to a thigh muscle of sailor turning round craft (9) |
| OPHTHALMOPLEGIA | Paralysis of one or more of the muscles of the eye (15) |
| GEEKSQUAD | Leg muscle of a mathlete? |
| DIAPHRAGM | Muscle of respiration |
