Holly Hunter in "The Piano" (3)
I believe the answer is:
'holly hunter in the piano' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for ada that I've seen before include "girl?" , "Computer language; girl's name" , "Palindromic girl's name" , "-- Lovelace, pioneer in computing" , "Computer lang.; f. name" .)