Might foolish Edison be single in December for bad behaviour? (12)
I believe the answer is:
disobedience
'for bad behaviour?' is the definition.
(eg disobeying rules)
'might foolish edison be single in' is the wordplay.
'might' becomes 'dce' (I can't explain this - if you can you should give a lot more credence to this answer).
'foolish' indicates an anagram (a foolish spelling).
'single' becomes 'I' (one).
'in' means one lot of letters goes inside another.
'edison'+'be'+'i'='edisonbei'
'edisonbei' anagrammed gives 'isobedien'.
'dce' going around 'isobedien' is 'DISOBEDIENCE'.
'december' acts as a link.
This may not be right. It may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for disobedience that I've seen before include "Refusal to take orders" , "Refusal to do what one is told" , "Insubordination" , "Not following rules" , "Defiance, unruliness" .)