Nobody is in doubt that air raid is over (3,5)
I believe the answer is:
all clear
'nobody is in doubt that air raid' is the definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.
'over' is the wordplay.
I cannot really see how this works, but
'over' could be 'all' (synonyms) and 'all' is located in the answer.
The remaining letters 'clear' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
'is' acts as a link.
Can you help me to learn more?
(Other definitions for all clear that I've seen before include "no further questions needed" , "unlike 21 [GREY AREAS] ?" , "Signal that it's safe to come out" , "I understand everything" , "cue for renewed action" .)