Sleuth appearing sweet when spotted? (4)

I believe the answer is:

dick

I believe this clue is a double definition.

'sleuth' is the first definition.
(dick can informally mean a detective)

'appearing sweet when spotted?' is the second definition.
(spotted dick is a type of dessert)

(Other definitions for dick that I've seen before include "See 9 Across" , "10

I've seen this clue in The Guardian.

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