Forbid going back to bed to get a bit warm (5)
I believe the answer is:
debar
'forbid' is the definition.
(I know that debar is a kind of forbid)
'going back to bed to get a bit warm' is the wordplay.
I cannot really understand how this works, but
an anagram of 'bed' is 'deb' which is located in the answer.
'a' is within the answer.
A single letter 'r' remains which might be clued in a way I don't understand.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for debar that I've seen before include "Refuse to admit" , "Blackball" , "Stop" , "Large advert" , "Formally prevent" .)