Party wearing dress in warehouse (6)
I believe the answer is:
godown
'warehouse' is the definition.
(I know that godown is a type of warehouse)
'party wearing dress' is the wordplay.
'party' becomes 'do' (do is a kind of party).
'wearing' means one lot of letters goes inside another.
'dress' becomes 'gown' (gowning is a kind of dressing).
'do' placed inside 'gown' is 'GODOWN'.
'in' acts as a link.
(Other definitions for godown that I've seen before include "storage facility in India" , "Leave university" , "eastern warehouse" .)