Part I for instance (9)
I believe the answer is:
character
This clue is a double definition.
'part' is the first definition.
('character' can be a synonym of 'part')
'i for instance' is the second definition.
(I is an example of a letter or character)
(Other definitions for character that I've seen before include "constitution" , "Stamp < letter" , "crank" , "Make-up" , "Personal moral qualities" .)