29 down
Drug-free
period,
end
of
addiction
–
do
not
swallow
one!
(4)
Drug-free period, end of addiction – do not swallow one! (4)
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The definition is at the end of the clue.
How the clue works
Do not swallow one! is the definition — a yarn being a tall tale you'd be daft to believe. Take YEAR (period), remove the E (that's the drug ecstasy gone, making it drug-free) to leave YAR, then tack on N (the last letter of, or 'end of', addiction) and you're there.