Complicated gears pull all but the end organ stops?
I believe the answer is:
earplugs
'the end organ stops?' is the definition.
I don't know anything about this answer so I cannot tell whether this works.
'complicated gears pull all but' is the wordplay.
'complicated' indicates an anagram.
'all but' means to remove the last letter ('all but' can mean 'almost' or 'nearly').
'gears'+'pull'='gearspull'
'gearspull' with its last letter taken off is 'gearspul'.
'gearspul' with letters rearranged gives 'EARPLUGS'.
Can you help me to learn more?
(Other definitions for earplugs that I've seen before include "noise abatement aids" , "Stoppers to keep noise out" , "aids to sleep?" .)