More stuffed suffering a power outage (5)
I believe the answer is:
added
'more' is the definition.
(similar in meaning)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for added that I've seen before include "Extra" , "Contributed" , "Counted up" , "Summed up" , "Appended; totalled" .)