More stuffed suffering a power outage (5)

I believe the answer is:

added

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'more' is the definition.
(similar in meaning)

I can't explain the remainder of the clue.

(Other definitions for added that I've seen before include "Extra" , "Contributed" , "Counted up" , "Summed up" , "Appended; totalled" .)

I've seen this clue in The Sunday Times and The Times.

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