Speared by Zulu, the rancorous Protestant (8)
I believe the answer is:
lutheran
'protestant' is the definition.
(I've seen this before)
'speared by zulu the rancorous' is the wordplay.
'speared by' indicates a hidden word (spear can mean to secure).
'LUTHERAN' can be found hidden inside 'zulu the rancorous'.
(Other definitions for lutheran that I've seen before include "Protestant church member" , "it could be Bach" , "Anti-Catholic" , "Bach, for instance" , "Of the Protestant Reformation" .)