Analyse a nervous condition (5,4)
I believe the answer is:
break down
'analyse' is the definition.
(synonyms)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for break down that I've seen before include "Collapse - analysis" , "Cease functioning" , "Fall through" , "Failure, collapse" , "Mechanical failure" .)