Charlie? Charlie! (4)
I believe the answer is:
dope
'charlie' is the definition.
(I've seen this before)
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for dope that I've seen before include "Simpleton" , "Charlie" , "Information; nitwit" , "Booby" , "Fool - model aeroplane varnish" .)