I dread setting poorly, having lost judgment (13)
I believe the answer is:
disintegrated
'lost judgment' is the definition.
Although both the answer and definition are past participle verbs, I cannot see how one could define the other.
'i dread setting poorly' is the wordplay.
'poorly' indicates an anagram (a poor spelling).
'i'+'dread'+'setting'='idreadsetting'
'idreadsetting' is an anagram of 'DISINTEGRATED'.
'having' acts as a link.
Can you help me to learn more?
(Other definitions for disintegrated that I've seen before include "Went to bits" , "Broke up" , "Fell to pieces" , "Fell apart" , "Fallen apart" .)