| HIDDENCAMERA | Common security device ... or a feature of 20-, 33- or 38-Across |
| PET | "What was the name of your first ___?" (common security question) |
| SCRAMBLER | Phone security device or rough ground motorcyclist |
| TRIPLEDOUBLE | Ten or more points, rebounds and assists in one game, in hoops lingo ... and a literal feature of 20-, 33- and 43-Across |
| SERGEANTATARMS | Chamber of the House of Commons security-and-ceremonial head on Parliament Hill |
| SERGEANT | ___-at-Arms of the House of Commons (Security and ceremonial official on Parliament Hill) |
| HEARTOFGLASS | Late-'70s Blondie hit, or a hint to the middle word in 20-, 33- or 41-Across |
| DONTGIVEMETHAT | "Save your excuses!" (or an appropriate response to being handed 20-, 33- or 39-Across) |
| MAHJONGTILE | Game piece on which 20-, 33- or 39-Across might be pictured |
| GAG | A joke or anecdote forming part of a comedian's act; a bit for a strong horse; a speech-muffling device; or, a closure imposed on a debate (3) |
| TRICK | Heraldic sketch of a coat of arms with tinctures (colours) indicated by letters or signs; an illusory, magical or puzzling feat or device; or, a sequence of cards in bridge (5) |
| POPPER | A press stud or snap-fastener; a string-activated streamer-ejecting novelty device; or, a utensil for bursting kernels of corn (6) |
| WOOMERA | Aboriginal spear-throwing device; or, a town north of Adelaide, site of a vast military testing grou |
| TRAP | Clay pigeon-hurling device; or, a stall from which a greyhound is released at the start of a race (4) |
| BUSTER | Cone-shaped "Elizabethan collar" worn by a pet as a type of medical device; or, a film with Phil Collins (6) |
| DETECTAPHONE | A secret bug for eavesdropping; or, in sci-fi, a voice-activated device or a language-translating machine (12) |
| TORNADO | "Wizard of Oz" plot device, or a reason for a performance? |
| ROUNDEL | Word for a circular insignia, painting, tondo, medallion or heraldic device; or, a ring dance (7) |
| MILL | Peppercorn- or rock salt-grinding device; or, a building for processing either grain into flour, logs into lumber, yarn into cloth or pulp into paper (4) |
| DIORAMA | From "view", a daguerrean picture-viewing device; or, a crafted miniature 3-D scene or model with figures (7) |
