Sweet kind of bed one can’t get into (5-3)

I believe the answer is:

apple-pie

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'sweet' is the definition.
(I've seen this before)

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

(Other definitions for apple-pie that I've seen before include "Dish - order - bed" , "Fruit dessert (with order suggesting perfection?)" , "(Characteristically American) sweet" , "Common dessert" , "Sweet pastry dish" .)

I've seen this clue in The Times.

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