Crossword Genius

Rubbish - with less hair! (10)

Ross

I believe the answer is:

balderdash

I'm a little stuck... Click here to teach me more about this clue!

'rubbish' is the definition.
(I've seen this before)

'with less hair' is the wordplay.
I cannot quite understand how this works, but
'with less hair' could be 'balder' (I've seen this before) and 'balder' is found within the answer.
The remaining letters 'dash' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for balderdash that I've seen before include "Claptrap" , "Senseless talk/writing" , "Codswallop" , "stupid talk" , "Rubbish" .)

I've seen this clue in the Sydney Morning Herald.
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