18 across
First
of
musicians
in
parish
goes
crazy,
shaking
recorder
(11)
First of musicians in parish goes crazy, shaking recorder (11)
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The definition is at the end of the clue.
How the clue works
The definition is recorder — a seismograph being the instrument that records earthquakes. Take M (the first letter of "musicians"), add it to the letters of parish goes, then "crazy, shaking" tells you to anagram the whole lot. Shake those up and out comes your answer.