The light breakfast carried up does come as a surprise (7)

I believe the answer is:

stagger

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

I can't explain the rest of the clue.

(Other definitions for stagger that I've seen before include "Teeter" , "Walk as though in danger of falling" , "bowl over" , "Reel; arrange so as to be out of line" , "Reel; amaze" .)

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