Waving gun at me? That could be dangerous (7)

I believe the answer is:

mutagen

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'waving gun at me? that could be dangerous' is the definition.
The definition suggests a singular noun which matches the answer.

'waving gun at me?' is the wordplay.
'waving' indicates an anagram (letters wave around).
'gun'+'at'+'me'='gunatme'
'gunatme' is an anagram of 'MUTAGEN'.

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(Other definitions for mutagen that I've seen before include "Changing agent" , "chemical substance?" , "Biochemical substance" .)

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