Old priest in the limelight (3)
I believe the answer is:
eli
'old priest' is the definition.
(Biblical character)
'in the limelight' is the wordplay.
'in' indicates a hidden word.
'ELI' can be found hidden inside 'limelight'.
(Other definitions for eli that I've seen before include "Old Testament priest, the prophet Samuel's teacher" , "Priest, teacher of Samuel" , "- Wallach, US actor" , "Old Testament high priest" , "Samuel's teacher (OT)" .)