Incisive treatment for rashes (6)

I believe the answer is:

shears

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'incisive treatment for rashes' is the definition.
I can't tell whether this defines the answer.

'treatment for rashes' is the wordplay.
'treatment for' indicates anagramming the letters (I've seen this in other clues).
'rashes' anagrammed gives 'SHEARS'.

Can you help me to learn more?

(Other definitions for shears that I've seen before include "Cuts the fleece of sheep" , "Cutting tool, for hedges perhaps" , "fractures under pressure" , "Pruners" , "Large scissors as for fleecing sheep" .)

I've seen this clue in the Evening Standard.

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