Lie around snorting cocaine in ostentatious display (5)
I believe the answer is:
eclat
'ostentatious display' is the definition.
(I've seen this in another clue)
'lie around snorting cocaine' is the wordplay.
'lie' becomes 'tale' (as in telling tales).
'around' says the letters should be written backwards.
'snorting' is an insertion indicator (snort can mean to ingest through the nose).
'cocaine' becomes 'C' (drugs abbreviation).
'tale' back-to-front is 'elat'.
'elat' placed around 'c' is 'ECLAT'.
'in' acts as a link.
(Other definitions for eclat that I've seen before include "Enthusiastic approval" , "Fame -- style" , "brilliant effort" , "Splendour; renown" , "Distinguished success" .)