Drunkard who might chuck cannabis (7)

I believe the answer is:

tosspot

I'm a little stuck... Click here to teach me more about this clue!

'drunkard who' is the definition.
'tosspot' can be an answer for 'drunkard' (I've seen this before). I'm not certain of the rest of the definition.

'chuck cannabis' is the wordplay.
'chuck' becomes 'toss' (synonyms).
'cannabis' becomes 'pot' (synonyms).
'toss'+'pot'='TOSSPOT'

'might' is the link.

Can you help me to learn more?

(Other definitions for tosspot that I've seen before include "Habitual drinker" , "supper, habitually" , "Fool" , "One drunkard" , "One drinker" .)

I've seen this clue in the Sydney Morning Herald.

Want a hint initially instead of a full solution? Install my app