Position of leading US banker, having taken too many courses? (7)
I believe the answer is:
overfed
'position of leading' is the definition.
Both the definition and answer are adjectives. Maybe you can see a link between them that I can't see?
'us banker having taken too many courses?' is the wordplay.
I cannot really see how this works, but
'taken' could be 'fed' (feeding is a kind of taking) and 'fed' is found in the answer.
'too many' could be 'over' (I've seen this in other clues) and 'over' is found in the answer.
This accounts for all the letters.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for overfed that I've seen before include "having had too much on one's plate?" , "stuffed" .)