Obstreperous attitude from French groom-to-be (8)
I believe the answer is:
defiance
'obstreperous attitude' is the definition.
'defiance' can be an answer for 'attitude' (I have seen 'Challenging attitude' mean 'defiance' so perhaps 'attitude' could also mean 'defiance'). I am not certain of the 'obstreperous' bit.
'from french groom-to-be' is the wordplay.
'from french' becomes 'de' ('from' in French).
'groom-to-be' becomes 'fiance' (man someone is engaged to).
'de'+'fiance'='DEFIANCE'
Can you help me to learn more?
(Other definitions for defiance that I've seen before include "Challenging behaviour" , "Refusal to obey" , "Challenging attitude" , "open disobedience" , "show of rebellion" .)