| KNOWN | Hardly a mystery |
| JIGSAW | A type of puzzle enjoyed by a dissectologist; a mystery solved by assembling pieces of information; or, a power tool with a reciprocating blade for cutting intricate shapes (6) |
| CLUE | Derived from a word meaning "ball of thread", a hint or tip that helps to solve a mystery or a puzzle (4) |
| CLEW | An old word for a ball of thread guiding one through a labyrinth or maze, hence the similar word for a hint that points towards the solution of a mystery or puzzle (4) |
| WHODUNIT | A work of fiction about the solving of a mystery, especially a murder (8) |
| ARCANUM | A Catholic union concealing a mystery |
| SOLVE | Find a solution to a mystery (5) |
| NOWS | "You're locked in a room with ___ and one door..." (start of a mystery quiz) |
| FORMR | A Mystery ___ ___. Bass: A Mushroom Planet Book (1960 sci-fi read by Winnipeg-born author Eleanor Cameron) |
| HERRING | Term for a false lead in a mystery story, red ... |
| AKEY | "It is a riddle, wrapped in a mystery, inside an enigma; but perhaps there is ___": Churchill |
| ENIGMA | Winston Churchill defined Russia as "a riddle, wrapped in a mystery, inside an ___" (6) |
| ITSYOU | Stereotypical shout when a murderer is revealed in a mystery |
| ALIBI | Comedy featuring Tom Selleck as a mystery writer navigating a career slump, Her ___ |
| DARREN | Hollyoaks bloke imprisoned in a hotel by a mystery kidnapper (6,7) |
| OSBORNE | Hollyoaks bloke imprisoned in a hotel by a mystery kidnapper (6,7) |
| TYRES | They go round endlessly creating a bit of a mystery |
| AGATHA | Christie who wrote a mystery novel about bridge (but presumably never closed one on purpose to be a dick) |
| ABLY | British learner cracking a mystery finally in a skilful way (4) |
| CRACKTHECASE | Solve a mystery, and a hint to the answers to the starred clues |
