Desperate man welcomes four in bed (5)
I believe the answer is:
divan
'bed' is the definition.
(type of bed)
'desperate man welcomes four' is the wordplay.
'desperate man' becomes 'dan' (as in Desperate Dan comics).
'welcomes' is an insertion indicator (in sense of 'invites in').
'four' becomes 'IV' (Roman numerals).
'dan' going around 'iv' is 'DIVAN'.
'in' is the link.
(Other definitions for divan that I've seen before include "Sideless, backless couch" , "Sort of bed" , "Couch - bed" , "Long backless sofa" , "Piece of furniture" .)