One at wheel sees rock in wet (8)
I believe the answer is:
motorist
'one at wheel' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.
'rock in wet' is the wordplay.
'rock' becomes 'tor' (tor is a kind of rock).
'in' indicates putting letters inside.
'wet' becomes 'moist' (similar in meaning).
'tor' placed into 'moist' is 'MOTORIST'.
'sees' is the link.
Can you help me to learn more?
(Other definitions for motorist that I've seen before include "Woman taking mini" , "One relying on car" , "Traveller" , "One on the road" , "One driving" .)