Argue with Hell's Angel about source of cannabis (6)
I believe the answer is:
bicker
'argue' is the definition.
(I've seen this before)
'hell's angel about source of cannabis' is the wordplay.
'hell's angel' becomes 'biker' (I've seen this in other clues).
'about' indicates putting letters inside.
'source of' says to take the initial letters.
The first letter of 'cannabis' is 'c'.
'biker' placed around 'c' is 'BICKER'.
'with' acts as a link.
(Other definitions for bicker that I've seen before include "Petty argument" , "Argue pettily" , "Squabble" , "Quarrel mildly" , "Quarrel feebly" .)