One with wheels — American or Greek high-flier (6)
I believe the answer is:
icarus
'greek high-flier' is the definition.
'icarus' can be an answer for 'high-flier' (I've seen this before). I am not sure about the 'greek' bit.
'one with wheels american' is the wordplay.
'one' becomes 'i' (Roman numeral).
'with' is a charade indicator (letters next to each other).
'wheels' becomes 'car' (wheels can informally mean a car).
'american' becomes 'US' (abbreviation for United States).
'i'+'car'+'us'='ICARUS'
'or' is the link.
Can you help me to learn more?
(Other definitions for icarus that I've seen before include "His wings melted when he flew too near the sun" , "Wax-winged flyer of Greek mythology" , "Son of Daedalus whose wings melted fatally" , "who made unwise flight?" , "Mythical Greek who flew too close to the sun - oops!" .)