Old priest the Spanish idolised originally (3)
I believe the answer is:
eli
'old priest' is the definition.
(Biblical character)
'the spanish idolised originally' is the wordplay.
'the spanish' becomes 'el'.
'originally' indicates taking the first letters.
The first letter of 'idolised' is 'i'.
'el'+'i'='ELI'
(Other definitions for eli that I've seen before include "Priest, teacher of Samuel" , "Man's name" , "Man" , "Old Testament priest, the prophet Samuel's teacher" , "Teacher of prophet Samuel" .)