Crossword Genius

Topless Italian has to tickle bottomless numskull (9)

Ross

I believe the answer is:

ignoramus

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'numskull' is the definition.
The definition and answer can be both people as well as being singular nouns.
Perhaps you can see a link between them that I don't see?

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for ignoramus that I've seen before include "One who knows nothing" , "One lacking knowledge" , "One could be blissful it's said" , "Stupid person" , "one in a state of bliss?" .)

I've seen this clue in The Guardian.
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