Tyrant drops sulphur in warehouse (5)
I believe the answer is:
depot
'warehouse' is the definition.
(I know that warehouse can be written as depot)
'tyrant drops sulphur' is the wordplay.
'tyrant' becomes 'despot' (synonyms).
'drops' indicates named letters should be taken away.
'sulphur' becomes 'S' (synonyms).
'despot' with 's' taken away is 'DEPOT'.
'in' is the link.
(Other definitions for depot that I've seen before include "Supply base" , "Storehouse, repository" , "Headquarters - storehouse" , "bus terminus" , "Place where buses and trains are kept" .)