Back from an Italian river, with a lead recipe for a toast dish (7)

I believe the answer is:

rarebit

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'dish' is the definition.
(rarebit is a kind of dish)

I don't understand the remainder of the clue.

(Other definitions for rarebit that I've seen before include "cheesy meal" , "Dish of grilled cheese on toast" , "Cheese on toast - arbiter (anag)" , "Cheese/toast savoury" , "on Welsh table?" .)

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

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