Crossword Genius

Rocky height appears in wet for one at wheel (8)

Ross

I believe the answer is:

motorist

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'one at wheel' is the definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.

'rocky height appears in wet' is the wordplay.
'rocky height' becomes 'tor' (I've seen this in another clue).
'appears in' means one lot of letters goes inside another.
'wet' becomes 'moist' (similar in meaning).
'tor' inserted into 'moist' is 'MOTORIST'.

'for' acts as a link.

Can you help me to learn more?

(Other definitions for motorist that I've seen before include "Traveller" , "Car-driver" , "One driving" , "One drives" , "Car driver" .)

I've seen this clue in The Independent.
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