18 across
Dishevelled,
drunk,
empty?
Dry
out!
(7)
Dishevelled, drunk, empty? Dry out! (7)
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The definition is at the beginning of the clue.
How the clue works
The definition is Dishevelled — untidy, messy, that sort of thing. Now look at "drUNK, EMPTy" and "Dry out" is nudging you to extract what's hiding inside those words — UNK, EMPT runs straight through the middle of it.