Crossword Genius

Alan to shake, having no key (6)

Ross

I believe the answer is:

atonal

'having no key' is the definition.
(I've seen this in another clue)

'alan to shake' is the wordplay.
'shake' is an anagram indicator.
'alan'+'to'='alanto'
'alanto' with letters rearranged gives 'ATONAL'.

(Other definitions for atonal that I've seen before include "An alto (anag) - without a fixed key" , "Unaccented" , "Lacking traditional musical tone structure" , "Describes music not written in a particular key" , "As modernist works" .)

I've seen this clue in the Sydney Morning Herald.
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