Sorry about the school head getting notice (3)
I believe the answer is:
sad
'sorry' is the definition.
(I've seen this before)
'the school head getting notice' is the wordplay.
'head' suggests taking the first letters.
'getting' means one lot of letters go next to another.
'notice' becomes 'ad'.
The initial letter of 'school' is 's'.
's'+'ad'='SAD'
'about' is the link.
(Other definitions for sad that I've seen before include "Unhappy or melancholy" , "Mournful and depressed" , "'Unhappy, sorry (3)'" , "upset" , "low" .)