Sorrow shown by a teacher in turmoil after end of skirmish (9)
I believe the answer is:
heartache
'sorrow' is the definition.
(heartache is a kind of sorrow)
'a teacher in turmoil after end of skirmish' is the wordplay.
'in turmoil' indicates anagramming the letters (I've seen this in other clues).
'after' says to put letters next to each other.
'end of' says to take the final letters.
The final letter of 'skirmish' is 'h'.
'a'+'teacher'='ateacher'
'ateacher' anagrammed gives 'eartache'.
'eartache' put after 'h' is 'HEARTACHE'.
'shown by' is the link.
(Other definitions for heartache that I've seen before include "Great sadness" , "mental anguish!" , "Emotional distress" , "Grief" , "it gives rise to anguish" .)