Nabokov title character
I believe the answer is:
'nabokov title character' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for ada that I've seen before include "Girl's name, one letter short of a man's name" , "Computer language; girl's name" , "Palindromic girl's name" , "Novel by Vladimir Nabokov" , "Computer lang.; f. name" .)