12 across
Make
speech
after
European
scientist’s
workplace
gets
involved
(9)
Make speech after European scientist’s workplace gets involved (9)
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The definition is at the end of the clue.
How the clue works
Right, so gets involved is the definition — think "elaborate" as in things getting intricate. For the wordplay, start with E for European, stick LAB (that's your scientist's workplace) straight after it, then tack ORATE (make speech) on the end — E, LAB, ORATE strung together gives you the answer.