Old actress learning name (5)
I believe the answer is:
loren
'old actress' is the definition.
(Sophia Loren)
'learning name' is the wordplay.
'learning' becomes 'lore' (both can mean tradition or knowledge).
'name' becomes 'n' (common abbreviation e.g. on forms).
'lore'+'n'='LOREN'
(Other definitions for loren that I've seen before include "See 15" , "Sophia -, Ital. actress" , "Sophia, actor" , "Sophia --, Italian film actress" , "Sofia, Italian film actress" .)