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Expert on the rocks? (9)

Ross

I believe the answer is:

geologist

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'expert on the rocks?' is the definition.
The answer and definition can be both people as well as being singular nouns.
Perhaps there's an association between them I don't understand?

This is the entire clue.

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(Other definitions for geologist that I've seen before include "One studying rocks" , "Specialist in the earth's history recorded in rocks" , "One studying the earth's crust" , "Specialist in the history of the earth in rocks" , "One studying the earth's structure" .)

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