Everyone getting into wicked tune (6)
I believe the answer is:
ballad
'tune' is the definition.
(type of song)
'everyone getting into wicked' is the wordplay.
'everyone' becomes 'all' (I've seen this before).
'getting into' is an insertion indicator.
'wicked' becomes 'bad' (associated in meaning).
'all' going within 'bad' is 'BALLAD'.
(Other definitions for ballad that I've seen before include "Narrative song with a recurrent refrain" , "Narrative poem or song" , "Simple song or poem" , "Love song" , "Lay, narrative song" .)