Having less hair — bit rubbish? (10)
I believe the answer is:
balderdash
'rubbish?' is the definition.
(I've seen this before)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for balderdash that I've seen before include "cobblers > GAME" , "stupid talk" , "Nonsense" , "Senseless talk/writing" , "Rubbish" .)