Priest: the Spanish one (3)
I believe the answer is:
eli
'priest' is the definition.
(I've seen this before)
'the spanish one' is the wordplay.
'the spanish' becomes 'el'.
'one' becomes 'i' (Roman numeral**).
'el'+'i'='ELI'
(Other definitions for eli that I've seen before include "Shiloh priest (Bible)" , "Samuel's teacher (OT)" , "Old Testament high priest" , "Biblical teacher of Samuel" , "High priest in the Book of Samuel" .)