One talking carelessly with fellow freedom fighter leads to the inevitable gallows (15)
I believe the answer is:
flibbertigibbet
But I can't explain it at all! Could you help me understand?
(Other definitions for flibbertigibbet that I've seen before include "Fickle chap" , "One who's unreliable" , "Frivolous or flighty person" , "Flighty type" , "Gossip" .)