Crossword Genius

Rubbish shoemaker convention? (1,4,2,8)

Ross

I believe the answer is:

a load of cobblers

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

'shoemaker convention?' is the definition.
I know nothing about this answer so I can't judge whether this works.

'rubbish' is the wordplay.
I cannot quite understand how this works, but
'rubbish' could be 'cobblers' (both can mean nonsense or false information) and 'cobblers' is found in the answer.
The remaining letters 'aloadof' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

I've seen this clue in The Daily Express.
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