Article on Charlie Parker's film (3,5)
I believe the answer is:
the birds
'film' is the definition.
(Alfred Hitchcock film)
'article on charlie parker's' is the wordplay.
'article' becomes 'the' (the definite article in English).
'on' says to put letters next to each other (in a down clue, letters appear on others).
'charlie parker's' becomes 'bird's' (jazz saxophonist nicknamed 'Bird').
'the'+'birds'='THE BIRDS'
(Other definitions for the birds that I've seen before include "1963 Hitchcock film" , "Old film" , "Greek drama" .)