Point finally reached after weeks of study in America (8)
I believe the answer is:
terminus
'point' is the definition.
(terminus is a kind of point)
'after weeks of study in america' is the wordplay.
'after' is a charade indicator (letters next to each other).
'weeks of study' becomes 'term' (I can't justify this - if you can you should believe this answer much more).
'america' becomes 'US' (United States).
'term' put next to 'in' is 'termin'.
'termin'+'us'='TERMINUS'
'finally reached' acts as a link.
This may not be right. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for terminus that I've seen before include "eg Paddington" , "Limit" , "End station" , "boundary marker" , "journey's end" .)