Harry Hoskins' left a Parisian to get drug (9)
I believe the answer is:
importune
'harry' is the definition.
(harry can mean to importune or bother)
'hoskins' left a parisian to get drug' is the wordplay.
'hoskins'' becomes 'I'm' (where the crossword setter is 'Hoskins').
'left' becomes 'port' (left side of a ship - opposite of starboard).
'a parisian' becomes 'un' ('a' in French).
'to get' says to put letters next to each other.
'drug' becomes 'e' (E is another name for ecstasy).
'im'+'port'+'un'+'e'='IMPORTUNE'
(Other definitions for importune that I've seen before include "badger" , "make improper advances to" , "plague" , "press to give answers" , "Harass" .)