30 across
Dorothy’s
aunt
and
British
drunk
get
involved
(9)
Dorothy’s aunt and British drunk get involved (9)
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The definition is at the end of the clue.
How the clue works
Look at get involved at the end — that's your definition. The wordplay builds the answer piece by piece: EM is Dorothy's aunt (Auntie Em from The Wizard of Oz), then BR as the abbreviation for British, and finally OILED, which is a lovely bit of slang for drunk. String them together and you've got your answer.