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 shaking recorder here is a seismograph, the device that records earthquakes. Take M (the first letter of "musicians"), pop it inside an anagram (signalled by "goes crazy") of PARISH GOES, and the whole lot rearranges into SEISMOGRAPH.