| SEROTONIN | Chemical substance, concentrated in certain parts of the brain, which functions as a neurotransmitter (9) |
| STKILDA | Group of volcanic islands in the Outer Hebrides which functions as a bird sanctuary (2,5) |
| POP | Generic term for a carbonated beverage, in certain parts of the U.S. |
| SODA | Generic term for a carbonated beverage, in certain parts of the U.S. |
| LEVEL | The amount of fluid in certain parts of a machine, for example. (5) |
| SIGN | Poster in which function's announced (4) |
| ORIYA | Language spoken in certain parts of India |
| ONYX | Stony Yankee in a certain part of the Bronx (4) |
| ANTIPHON | A short passage, usually from the Bible, recited or sung as a response after certain parts of a liturgical service |
| LEAVESALONE | Certain parts of the book, only, one doesn't tamper with (6,5) |
| ATRIAL | Of a certain part of the heart |
| RETRACT | Take back again to a certain part of the country (7) |
| SEEPAGE | Refer to a certain part of the book for what has been leaked (7) |
| EYEOFRA | A being in ancient Egyptian mythology that functions as a feminine counterpart to the sun god |
| ICEHOCKEY | Team sport in which a puck functions as a ball (3,6) |
| RURAL | Certain parts of the country? (5) |
| TIFF | Stiffened at certain parts of the argument (4) |
| THALAMUS | Either of two parts of the brain involved in regulating the senses and motor signals (8) |
| UVEAL | Pertaining to a certain part of the eye |
| THIRDS | In certain parts, this is out of the way (6) |
