After arranging song, little jerk is possessing knowledge (7)
I believe the answer is:
gnostic
'possessing knowledge' is the definition.
I can't tell whether this definition defines the answer.
'after arranging song little jerk' is the wordplay.
'after' is a charade indicator (letters next to each other).
'arranging' indicates anagramming the letters.
'little jerk' becomes 'tic'.
'song' anagrammed gives 'gnos'.
'gnos' next to 'tic' is 'GNOSTIC'.
'is' is the link.
Can you help me to learn more?
(Other definitions for gnostic that I've seen before include "Having special mystical knowledge, costing a lot" , "Occult" , "Relating to mystical knowledge" .)