Rock legends used boring cliches willy-nilly (4,6)
I believe the answer is:
cold chisel
'rock legends' is the definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.
'used boring cliches willy-nilly' is the wordplay.
'used' becomes 'old' (similar in meaning).
'boring' is an insertion indicator (to bore something can mean to drill into it).
'willy-nilly' is an anagram indicator (willy-nilly means randomly or without planning).
'cliches' is an anagram of 'cchisel'.
'old' put inside 'cchisel' is 'COLD-CHISEL'.
Can you help me to learn more?
(Another definition for cold chisel that I've seen is " Tool".)