Pacifist and warhorse? Fancy! (5)
I believe the answer is:
covet
'fancy' is the definition.
(I've seen this in another clue)
'pacifist and warhorse?' is the wordplay.
'pacifist' becomes 'co' (conscientious objector).
'and' says to put letters next to each other.
'warhorse?' becomes 'vet' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'co'+'vet'='COVET'
Can you help me to learn more?
(Other definitions for covet that I've seen before include "Envy" , "Jealously desire" , "Want something belonging to another" , "Hanker after" , "Yearn to possess (another's property)" .)