Flighty individual and female liberationist sent finally by one to gallows (15)

I believe the answer is:

flibbertigibbet

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'flighty individual' is the definition.
(a flibbertigibbet is a flighty or foolish person)

'female liberationist sent finally by one to gallows' is the wordplay.
'female' becomes 'f' (abbreviation).
'liberationist' becomes 'libber' (informal term).
'finally' suggests the final letters.
'by one' becomes 'i' (Roman numeral. I am not sure about the 'by' bit.).
'to gallows' becomes 'gibbet' (synonyms).
The last letter of 'sent' is 't'.
'f'+'libber'+'t'+'i'+'gibbet'='FLIBBERTIGIBBET'

'and' is the link.

Can you help me to learn more?

(Other definitions for flibbertigibbet that I've seen before include "Till Eulenspiegel, say" , "Frivolous or flighty person" , "One who's unreliable" , "Fickle chap" , "Flighty type" .)

I've seen this clue in The Guardian.

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