Smoke heroin, as St George did? (5,3,6)
I believe the answer is:
chase the dragon
'st george did?' is the definition.
I don't know anything about this answer so I cannot judge whether it can be defined by this definition.
'smoke heroin as' is the wordplay.
I cannot really see how this works, but
'smoke' could be 'drag' (I have seen 'Short smoke' mean 'drag' so perhaps 'smoke' could also mean 'drag') and 'drag' is found within the answer.
'heroin' could be 'h' (synonyms) and 'h' is present in the answer.
'as' is within the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for chase the dragon that I've seen before include "use heroin" , "Maybe follow in George's footsteps" .)