Dear Kim,
May I say excellent on getting somany titles into your poem, but it does not quite get tobe a clerihew :
I confess; I am spellbound, with Alfred Hitchcock,
Without a shadow of a doubt, it is mystery that I am about. - NOT a rhyme ?
Rebecca was no psycho, watching birds from her rear window,
This Mastermind of Mystery still sends chills from my head to my tippy toes.
-- I think the last 2 lines could rhyme if you left the s off toes, but would need a little recasting :
This Mastermind of Mystery sends chills - from my head to my toe.
I suspect you will make a better job of a revision than I just have !
Love
Alan