I note chin twitching in delicate situation (2,4,3)
I believe the answer is:
on thin ice
'delicate situation' is the definition.
I don't know anything about this answer so I cannot judge whether it can be defined by this definition.
'i note chin twitching' is the wordplay.
'twitching' indicates an anagram (letters twitch or move into a new order).
'i'+'note'+'chin'='inotechin'
'inotechin' anagrammed gives 'ON THIN ICE'.
'in' is the link.
Can you help me to learn more?
(Other definitions for on thin ice that I've seen before include "At risk" , "like a daredevil skater?" , "In deep water" , "that can make one vulnerable" , "Insecure" .)