Musical nursemaids emerging from their shell (5)

I believe the answer is:

annie

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'musical' is the definition.
(Annie is a Broadway musical)

I can't explain the remainder of the clue.

(Other definitions for annie that I've seen before include "Name of girl (with gun)" , "said to carry a gun" , "Musical inspired by comic strip" , "Musical about markswoman" , "- Hall, Woody Allen film" .)

I've seen this clue in the Sydney Morning Herald.

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