Uncertainly peel off tape that's sticky ... sweet! (6,5)

I believe the answer is:

toffee apple

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But I can't explain it at all! Could you help me understand?

(Other definitions for toffee apple that I've seen before include "treat for kids" , "Coated fruit on a stick" , "Sticky fairground attraction?" .)

I've seen this clue in The Everyman puzzle in The Observer.

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