Everyone enthralled by wicked song (6)
I believe the answer is:
ballad
'song' is the definition.
(ballad is a kind of song)
'everyone enthralled by wicked' is the wordplay.
'everyone' becomes 'all' (I've seen this before).
'enthralled by' means one lot of letters goes inside another ('enthral' can mean 'capture').
'wicked' becomes 'bad' ('bad' can be similar in meaning to 'wicked').
'all' inserted into 'bad' is 'BALLAD'.
(Other definitions for ballad that I've seen before include "Slow romantic song" , "romance" , "Love song" , "A simple or old song" , "Narrative poem or song" .)