| Highly confidential |
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| Secret, confidential |
Mirror Classic |
07 Dec 2023 |
| Secret |
New York Times |
22 Jun 2023 |
| On the down-low |
Universal |
30 Mar 2023 |
| Secretive |
New York Times |
07 Aug 2022 |
| Be quite and don't say another word that's top secret |
Irish Times Crosaire |
13 Jan 2022 |
| Secret |
The Guardian Quick |
10 Dec 2021 |
| Top secret |
Eugene Sheffer |
13 Jan 2021 |
| Top-secret |
Eugene Sheffer |
08 Aug 2019 |
| One gag following another is similar to 1 across |
Irish Times Crosaire |
30 Dec 2016 |
| Top-secret ... or a hint to 17-, 25-, 39- and 56-Across (AND 66-Across!) |
New York Times |
21 Mar 2016 |
| Conducted with hidden aims or methods |
The Telegraph General Knowledge |
28 Feb 2016 |
| Cloak-and-dagger, secret |
Irish Times Simplex |
04 Jul 2015 |
| Advice to Sweet Charlotte |
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| Top secret |
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| Top-secret |
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| Top-secret |
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| Secret |
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| Super-secret |
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| Secret |
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| Classified |
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| Top secret |
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| Strictly confidential |
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| Top secret |
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| Covert |
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| Advice to Charlotte |
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| Top secret. |
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| Policy of concealment. |
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| Secrecy: Colloq. |
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| Carried on with secrecy. |
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| Supersecret. |
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