Money earned by cabbie? That should turn some heads!
I believe the answer is:
screwdriver
'money earned by cabbie? that should' is the definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.
'turn some heads' is the wordplay.
I cannot quite understand how this works, but
'turn' could be 'screw' (I have seen 'fast turn' mean 'screw' so perhaps 'turn' could also mean 'screw') and 'screw' is found in the answer.
The remaining letters 'driver' is a valid word which might be clued in a way I don't understand.
This may be the basis of clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for screwdriver that I've seen before include "Woodworker's tool" , "it gives the fixer a turn" , "Tool used to tighten" , "Tool for turning fastening device" , "Vodka/orange cocktail" .)