Typist is principal paying guest (10)

I believe the answer is:

keyboarder

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'typist' is the definition.
I know nothing about this answer so I cannot judge whether this works.

'principal paying guest' is the wordplay.
'principal' becomes 'key'.
'paying guest' becomes 'boarder' (I've seen this in another clue).
'key'+'boarder'='KEYBOARDER'

'is' is the link.

Can you help me to learn more?

(Another definition for keyboarder that I've seen is " one typing text".)

I've seen this clue in The Times.

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