Letter from personality (9)
I believe the answer is:
character
This clue is a double definition.
'letter' is the first definition.
(I've seen this before)
'personality' is the second definition.
(I've seen this before)
'from' acts as a link.
(Other definitions for character that I've seen before include "Imaginary person in a work of fiction" , "crank" , "Amusing individual" , "card" , "Nonconformist" .)