Upset teacher grabbing unmarried mum (8)
I believe the answer is:
bothered
'upset' is the definition.
(thesaurus)
'teacher grabbing unmarried mum' is the wordplay.
'teacher' becomes 'bed' (bachelor of education).
'grabbing' is an insertion indicator.
'unmarried mum' becomes 'other' (I can't explain this - if you can you should believe this answer much more).
'bed' going around 'other' is 'BOTHERED'.
Can you help me to learn more?
(Other definitions for bothered that I've seen before include "Made an effort -- put out" , "Was a pest" , "''Bewitched, ... and bewildered'' (song) (8)" , "` `Bewithched, ... and bewildered' '" , "Disturbed" .)