Le Pen, a leader in France after source of French wine - and baguette? (6,4)

I believe the answer is:

crusty loaf

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'le pen a leader in france after source' is the definition.
I don't know anything about this answer so I can't judge whether this works.

'french wine and baguette?' is the wordplay.
'french wine' becomes 'crusty' (I can't explain this - if you can you should give a lot more credence to this answer).
'and' is a charade indicator (letters next to each other).
'baguette?' becomes 'loaf' (baguette is a kind of loaf).
'crusty'+'loaf'='CRUSTY LOAF'

'of' is the link.

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I've seen this clue in The Guardian.

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