Crossword Genius

Mess up the topping for summer puddings (5)

Ross

I believe the answer is:

duffs

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

'puddings' is the definition.
(duff is a kind of pudding)

I don't understand the remainder of the clue.

Can you help me to learn more?

I've seen this clue in The Independent.
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