Crossword Genius

Nobody is in doubt that air raid is over (3,5)

Ross

I believe the answer is:

all clear

I'm a little stuck... Click here to teach me more about this clue!

'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" .)

I've seen this clue in The Globe and Mail.
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