On TV, there's one named Albert (6)
I believe the answer is:
square
'named albert' is the definition.
The definition suggests a singular noun which matches the answer.
'on tv there's one' is the wordplay.
I cannot quite understand how this works, but
'on' could be 're' (regarding) and 're' is found in the answer.
'one' could be 'a' (a thing is one thing) and 'a' is found in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for square that I've seen before include "Type of rectangle" , "Figure with four equal sides" , "Right-angled; plaza" , "bashed by soldiers in training?" , "Stick-in-the-mud -- quadrangle" .)