Finding out leader's changed? Fancy! (8)
I believe the answer is:
yearning
'fancy' is the definition.
(thesaurus)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for yearning that I've seen before include "Hankering, longing" , "Longing, pining" , "Hunger" , "Feeing great desire" , "Longing - desire" .)