Disc just becoming known as world-beating (6-8)
I believe the answer is:
record-breaking
'world-beating' is the definition.
Both the answer and definition are adjectives.
Perhaps they are linked in a way I don't understand?
'disc just becoming known' is the wordplay.
'disc just' becomes 'record' (I can't explain this - if you can you should give a lot more credence to this answer).
'becoming known' becomes 'breaking' ('break' can be a synonym of 'become known').
'record'+'breaking'='RECORD-BREAKING'
'as' is the link.
Can you help me to learn more?
(Other definitions for record-breaking that I've seen before include "setting a new standard" , "Surpassing previous maximum achievement" .)