Little rascal's very difficult question head ignored (6)
I believe the answer is:
tinker
'little rascal's' is the definition.
(both can mean a misbehaving child)
'very difficult question head ignored' is the wordplay.
'very difficult question' becomes 'stinker' (informal term for a difficult question).
'head ignored' means to remove the first letter.
'stinker' with its initial letter removed is 'TINKER'.
(Other definitions for tinker that I've seen before include "Fiddle with machinery" , "Make trivial adjustments - itinerant tradesman" , "Itinerant worker" , "Work aimlessly, at repairs say" , "Mess around with" .)