Find it's a brief summary (3-4)
I believe the answer is:
run-down
I believe this is a double definition.
'find' is the first definition.
(I've seen this before)
'a brief summary' is the second definition.
(I've seen this before)
'it's' is the link.
(Other definitions for run-down that I've seen before include "In a neglected state" , "Shabby" , "Dilapidated" , "Worn-out" , "Exhausted" .)