Crossword Genius

Pan with King Edward potato, perhaps (7)

Ross

I believe the answer is:

roaster

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

'edward potato perhaps' is the definition.
I can't judge whether this definition defines the answer.

'pan with king' is the wordplay.
'pan' becomes 'roast' (I've seen this before).
'with' says to put letters next to each other.
'king' becomes 'er' (I've seen this in other clues).
'roast'+'er'='ROASTER'

Can you help me to learn more?

(Other definitions for roaster that I've seen before include "cooker" , "Chicken, perhaps" , "A resort (anag.)" , "Oven-ready bird" , "Fowl for the oven" .)

I've seen this clue in The Guardian.
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