23 down
A
quantity
of
drug
wife’s
swallowed:
look
for
water
(5)
A quantity of drug wife’s swallowed: look for water (5)
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The definition is at the end of the clue.
How the clue works
See look for water at the end — that's your definition, what a dowser does. For the wordplay, take DOSE (a quantity of drug) and pop W (wife's) inside it, with "swallowed" telling you to do the insertion — so it's DO-W-SE all the way through.