Place for storage of French drug (5)
I believe the answer is:
depot
'place for storage' is the definition.
(I've seen this before)
'of french drug' is the wordplay.
'of french' becomes 'de' ('of' in French).
'drug' becomes 'pot' (slang term for cannabis).
'de'+'pot'='DEPOT'
(Other definitions for depot that I've seen before include "Bus garage" , "bus terminus" , "Storehouse or terminus" , "Storehouse or main bus station (5)" , "Headquarters - storehouse" .)