It's more meaningful about what goes on (5)
I believe the answer is:
added
'it's more' is the definition.
(similar in meaning)
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for added that I've seen before include "Contributed" , "Totted" , "Appended; totalled" , "Counted up" , "Extra" .)