Zip slightly less rubbish? (3,1,5)

'zip slightly' is the definition.
I don't know anything about this answer so I cannot tell whether this works.

'less rubbish?' is the wordplay.
I cannot really understand how this works, but
'less' could be 'notas' (I've seen this in another clue) and 'notas' is present in the answer.
'rubbish?' could be 'crap' and 'crap' is found within the answer.
This accounts for all the letters.
This explanation may well be incorrect...

Can you help me to learn more?