Crossword Genius

Relief for one said to have been duped (7)

Ross

I believe the answer is:

succour

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'relief' is the definition.
(I know that relief can be written as succour)

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for succour that I've seen before include "helping hand" , "Render assistance to" , "Assistance, support" , "Isolated" , "Give assistance in time of difficulty" .)

I've seen this clue in The Globe and Mail.
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