One crony turned out quaintly stoned (9)
I believe the answer is:
lapidated
'stoned' is the definition.
('lapidate' can be a synonym of 'stone')
'one crony turned out quaintly' is the wordplay.
'one' becomes 'i' (Roman numeral).
'crony' becomes 'pal' (synonyms).
'turned' says the letters should be written in reverse.
'out quaintly' becomes 'dated' (I've seen this in another clue. I am not sure about the 'quaintly' bit.).
'i'+'pal'='ipal'
'ipal' written backwards gives 'lapi'.
'lapi'+'dated'='LAPIDATED'
Can you help me to learn more?
(Another definition for lapidated that I've seen is " Stoned".)