On TV, is he a square? (6)
I believe the answer is:
albert
'a square?' is the definition.
Both the definition and answer are singular nouns.
Perhaps you can see an association between them that I can't see?
'on tv is he' is the wordplay.
'on tv' becomes 'al' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'is he' becomes 'Bert'.
'al'+'bert'='ALBERT'
Can you help me to learn more?
(Other definitions for albert that I've seen before include "M [MUSEUM] with 18 [VICTORIA]" , "Victoria's partner" , "Short kind of watch-chain" , "London bridge, Memorial" , "Prince of Monaco" .)