Girl is terribly clumsy, having mislaid manuscript (4)
I believe the answer is:
lucy
'girl' is the definition.
(girl's name)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for lucy that I've seen before include "- in the Sky with Diamonds (The Beatles)" , "-- Locket, nursery rhyme" , "Ms Locket?" .)