Deity partial to warfare, seemingly? (4)
I believe the answer is:
ares
'deity' is the definition.
(Ares is an example)
'partial to warfare seemingly?' is the wordplay.
'partial to' indicates the answer is hidden within the clue (the answer forms part of the clue).
'ARES' is hidden in the letters of 'warfare seemingly'.
(Other definitions for ares that I've seen before include "War-god" , "Land measures" , "Olympian" , "Greek god of war" , "Belligerent god" .)