Crossword Genius

Affection for a swamp (4,4)

Ross

I believe the answer is:

soft spot

'affection' is the definition.
(I know that soft spot is a type of affection)

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

(Other definitions for soft spot that I've seen before include "showing fondness" , "Feeling of affection towards person - not hard" , "Emotional susceptibility" , "Sentimental fondness" , "Sentimental affection" .)

I've seen this clue in The Guardian.
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