Old priest from Chapelizod (3)
I believe the answer is:
'old priest' is the definition.
'from chapelizod' is the wordplay.
'from' indicates a hidden word.
'ELI' is hidden within 'chapelizod'.
(Other definitions for eli that I've seen before include "Priest, teacher of Samuel" , "OT high priest" , "Teacher of prophet Samuel" , "Old Testament priest, the prophet Samuel's teacher" , "- Whitney invented the cotton gin in seventeen ninety three" .)