Like the flibbertigibbet Miss Bird? (7)

I believe the answer is:

flighty

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'like' is the definition.
Both the answer and definition are adjectives. Perhaps they are linked in a way I don't understand?

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for flighty that I've seen before include "Frivolous - irresponsible" , "as a bird?" , "Fickle; erratic" , "Changeable" , "rather impetuous?" .)

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