Crossword Genius

Tool cauterises wound after third of stitches removed (9)

Ross

I believe the answer is:

secateurs

'tool' is the definition.
(gardening tool)

I don't understand the rest of the clue.

(Other definitions for secateurs that I've seen before include "Pruning tool" , "Gardener's tool" , "They make cuts" , "Small pruning shears" , "Clippers used for pruning plants" .)

I've seen this clue in The Times.
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