Crossword Genius

One will cut devious histrionics from five onwards? (7)

Ross

I believe the answer is:

incisor

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

'one will cut' is the definition.
Although both the answer and definition are singular nouns, I cannot see how one could define the other.

'devious histrionics from five onwards?' is the wordplay.
I cannot quite understand how this works, but
'from' could be 'in' (I've seen this in other clues) and 'in' is located in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for incisor that I've seen before include "something with bite" , "Ivory perhaps" , "companion could be Goofy" , "Narrow-edged tooth" , "One takes a bite" .)

I've seen this clue in The Telegraph.
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