One often seen lying in doorway is teetotaller? (7,8)
I believe the answer is:
draught excluder
I believe this is a double definition.
'one often seen lying in doorway' is the first definition.
(item placed in front of a door)
'is teetotaller?' is the second definition.
(someone turning down alcohol such as draughts)
(Other definitions for draught excluder that I've seen before include "Solution to current problem" , "Current bar" , "that might stop delivery of beer?" .)