Peripheral devices installing back door hiding 100 computer commands (9)

Guardian Cryptic #29199 | 5 Down | 2023-10-12
Generating...

I haven't cracked this one yet — but the brilliant team at Fifteensquared have:

A double envelope (‘installing’ and ‘hiding’) of C (Roman numeral, ‘100’) in ROOD, a reversal (‘back’) of ‘door’ in MICE (‘peripheral devices’).

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