Actually, I forgot I was going to come back to this one...
"US group in a Hitchcock film, we're told" (3,5)
Now, obviously the "we're told" is the soundalike THE BYRDS and THE BIRDS, but I'm just wondering which of these should be the answer? Unfortunately the second letter of the second word (the Y or I) doesn't interlock with any other answers so it's a bit of a toss-up...