11 across
Engaged
in
drink,
CIA
annulled
cryptic
system
of
old
Rome
(6,8)
Engaged in drink, CIA annulled cryptic system of old Rome (6,8)
hints
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checks
0
hints
The definition is at the end of the clue.
How the clue works
The system of old Rome is built by taking JAR, a slang word for a drink, and wrapping it around an anagram (signalled by "cryptic") of CIA ANNULLED. So JAR opens up as J...AR and the jumbled letters of CIA ANNULLED sit inside to give ULIANCALEND, spelling out JULIAN CALENDAR.