Bold disobedience intended after first half of demo (8)
I believe the answer is:
defiance
'bold disobedience' is the definition.
(I've seen this before)
'intended after first half of demo' is the wordplay.
'intended' becomes 'fiance' (I've seen this before).
'after' is a charade indicator (letters next to each other).
'first half of' suggests halving the letters.
'demo' with half the letters taken is 'de'.
'fiance' put after 'de' is 'DEFIANCE'.
(Other definitions for defiance that I've seen before include "Resistance to authority" , "Hostile challenge" , "bold opposition" , "Challenging attitude" , "Insubordination" .)