For Spaniards, the One Priest (3)
I believe the answer is:
eli
'priest' is the definition.
(biblical figure)
'for spaniards the one' is the wordplay.
'for spaniards the' becomes 'el' ('the' in Spanish).
'one' becomes 'i' (Roman numeral).
'el'+'i'='ELI'
(Other definitions for eli that I've seen before include "Highest priest at Shiloh" , "Priest at Shiloh (Samuel)" , "OT high priest" , "Old Testament high priest" , "Man's name" .)