Lose head in this teary unravelling (8)
I believe the answer is:
hysteria
'lose head in this teary unravelling' is the definition.
The definition suggests a singular noun which matches the answer.
This is the entire clue.
(Other definitions for hysteria that I've seen before include "Frenzied emotional state" , "Psychoneurotic condition" , "emotional meltdown" , "Emotional frenzy" , "Uncontrolled emotion" .)