One who’ll go far perhaps rebuked about line supporting rash study misguidedly (9,5)

'one who'll go far perhaps rebuked' is the definition.
I don't know anything about this answer so I cannot judge whether this works.

'line supporting rash study misguidedly' is the wordplay.
'line' becomes 'child' (I am not sure about this - if you are sure you should believe this answer much more).
'supporting' is a charade indicator (letters next to each other) (in a down clue, some letters go below others).
'misguidedly' indicates an anagram.
'rash'+'study'='rashstudy'
'rashstudy' is an anagram of 'thursdays'.
'child' put after 'thursdays' is 'THURSDAYS CHILD'.

'about' is the link.

Can you help me to learn more?