Racer showing expertise after gear twisted (2-4)

I believe the answer is:
go-cart
'racer' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Maybe you can see an association between them that I can't see?
'expertise after gear twisted' is the wordplay.
'expertise' becomes 'art' (I've seen this in another clue).
'after' means one lot of letters go next to another.
'gear' becomes 'cog' (I can't explain this - if you can you should give a lot more credence to this answer).
'twisted' shows that the letters should be reversed in order.
'cog' back-to-front is 'goc'.
'art' put after 'goc' is 'GO-CART'.
'showing' is the link.
Can you help me to learn more?
(Other definitions for go-cart that I've seen before include "Vehicle used for recreational racing - baby-walker" , "Got car (anag.)" , "Child's vehicle" , "Low racing vehicle" .)
