He is right about the turntable (6)
I believe the answer is:
albert
'the turntable' is the definition.
Both the answer and definition are singular nouns.
Maybe there's an association between them I don't understand?
'he is right' is the wordplay.
'he' becomes 'Al'.
'is' becomes 'be'.
'right' becomes 'rt' (abbreviation as in Rt Hon- the Right Honourable).
'al'+'be'+'rt'='ALBERT'
'about' acts as a link.
Can you help me to learn more?
(Other definitions for albert that I've seen before include "Prince with 24" , "German prince" , "Victim of lion" , "Kind of watch chain" , "Queen Victoria's Prince Consort" .)