Note disease’s culmination in pink colour of part of the eye (7)

'of part of the eye' is the definition.
(I've seen this in another clue)

'note disease's culmination in pink colour' is the wordplay.
'note' becomes 'n' (abbreviation).
'disease's culmination' becomes 'e' (I can't justify this - if you can you should believe this answer much more).
'in' is an insertion indicator.
'pink colour' becomes 'coral' (I've seen this before).
'n'+'e'='ne'
'ne' going into 'coral' is 'CORNEAL'.

Can you help me to learn more?