Pull on weed relentlessly shackles donkey (5-5)
I believe the answer is:
chain-smoke
'pull' is the definition.
(thesaurus)
'shackles donkey' is the wordplay.
'shackles' becomes 'chains' (chain is a kind of shackle).
'donkey' becomes 'moke' (moke is a kind of donkey).
'chains'+'moke'='CHAIN-SMOKE'
'on weed relentlessly' is the link.
I am not very happy about this link. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for chain-smoke that I've seen before include "Get through cigarettes one after another" , "Puff non-stop" , "Light one fag after another" , "Get through fags one after the other" , "Keep dragging" .)