1977 Broadway hit (5)
I believe the answer is:
annie
'1977 broadway hit' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for annie that I've seen before include "said to carry a gun" , "Woman" , "Inane (anag) - girl (with a gun?)" , "musical movie" , "Musical heroine" .)