Oscar to appear with piano legends playing benefit (3,3,7)
I believe the answer is:
old age pension
'playing benefit' is the definition.
The definition suggests a singular noun which matches the answer.
'oscar to appear with piano legends' is the wordplay.
'oscar' becomes 'O' (phonetic alphabet: alpha, bravo, charlie etc.).
'to appear with' indicates an anagram.
'piano'+'legends'='pianolegends'
'o' with its letters mixed up with 'pianolegends' gives 'OLD-AGE PENSION'.
Can you help me to learn more?
(Other definitions for old age pension that I've seen before include "Senior citizen's allowance" , "Source of income" .)