Crossword Genius

Eccentric Scotsman standing on head (3)

Ross

I believe the answer is:

cam

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'eccentric' is the definition.
(an eccentric is a mechanical device such as a cam)

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for cam that I've seen before include "running through university city?" , "Projection on a rotating shaft in contact with another part" , "English river" , "Reciprocal-motion part" , "Part of engine" .)

I've seen this clue in The Globe and Mail.
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