Crossword Genius

Where the junk dealers go all metric? (5,4)

Ross

I believe the answer is:

scrap yard

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

'dealers go all metric?' is the definition.
I don't know anything about this answer so I cannot judge whether this works.

'where the junk' is the wordplay.
I cannot really understand how this works, but
'junk' could be 'crap' (I've seen this in another clue) and 'crap' is present in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

I've seen this clue in the Evening Standard.
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