Take part in bagging Ecstasy from haul (5)
I believe the answer is:
heave
'haul' is the definition.
(thesaurus)
'take part in bagging ecstasy' is the wordplay.
'take part in' becomes 'have'.
'bagging' means one lot of letters goes inside another (I've seen this in other clues).
'ecstasy' becomes 'e' (informal term for the drug).
'have' placed around 'e' is 'HEAVE'.
'from' is the link.
(Other definitions for heave that I've seen before include "Pull hard; (sea) swell" , "Express" , "cast like this" , "Be sick; rise and fall" , "Lift or haul with great effort" .)