Using part of sketchbook, handled ruler (4)

I believe the answer is:

khan

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'using part' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Maybe they are linked in a way I don't understand?

'of sketchbook handled ruler' is the wordplay.
'of' indicates the answer is hidden within the clue.
'KHAN' is hidden within 'sketchbook handled ruler'.

Can you help me to learn more?

(Other definitions for khan that I've seen before include "Persian governor" , "Title given to rulers in Asian countries" , "Imran --, cricketer" , "Central Asian ruler" , "Central Asian title of respect" .)

I've seen this clue in The Telegraph.

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