Arm all? Safe, change order, situation not dangerous (5,5)

I believe the answer is:

false alarm

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'order situation not dangerous' is the definition.
I can't tell whether this definition defines the answer.

'arm all? safe change' is the wordplay.
'change' is an anagram indicator.
'arm'+'all'+'safe'='armallsafe'
'armallsafe' is an anagram of 'FALSE ALARM'.

Can you help me to learn more?

(Other definitions for false alarm that I've seen before include "Warning proving unnecessary" , "Panic over" , "unfounded scare?" .)

I've seen this clue in the Sydney Morning Herald.

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