Bed for Bill say (4-6)
I believe the answer is:
four-poster
'bed' is the definition.
(I've seen this before)
'bill say' is the wordplay.
I cannot quite see how this works, but
'bill' could be 'poster' (synonyms) and 'poster' is located in the answer.
The remaining letters 'four' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
'for' acts as a link.
Can you help me to learn more?
(Other definitions for four-poster that I've seen before include "Canopied bed" , "Large bed" , "Style of bed" , "Curtained bed" , "Imposing item of bedroom furniture" .)