Crossword Genius

A dangerous thing to get stroppy with! (5)

Ross

I believe the answer is:

razor

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'a dangerous thing' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Maybe you can see an association between them that I can't see?

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for razor that I've seen before include "Tonsorial tool" , "Stubble cutter" , "Shaver" , "Device for shaving" , "Shaver's kit" .)

I've seen this clue in the Evening Standard.
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