Crossword Genius

Such pencils don't write (7)

Ross

I believe the answer is:

styptic

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'such' is the definition.
Both the definition and answer are adjectives. Perhaps you can see an association between them that I don't see?

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for styptic that I've seen before include "Stopping bleeding" , "This pencil checks bleeding as from shaving" , "Checking blood flow like shaving pencil" .)

I've seen this clue in the Evening Standard.
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