Want curtains covering entrance to room (6)
I believe the answer is:
dearth
'want' is the definition.
(both can mean a lack or scarcity)
'curtains covering entrance to room' is the wordplay.
'curtains' becomes 'death' (I've seen this before).
'covering' is an insertion indicator.
'entrance to' indicates taking the first letters.
The first letter of 'room' is 'r'.
'death' going around 'r' is 'DEARTH'.
(Other definitions for dearth that I've seen before include "Shortage, lack" , "want" , "Insufficient amount" , "poverty" , "Scarcity - lack" .)