Teaching graduate gets sack (3)
I believe the answer is:
bed
I believe this clue is a double definition.
'teaching graduate' is the first definition.
(bachelor of education)
'sack' is the second definition.
('in the sack' means 'in bed')
'gets' is the link.
(Other definitions for bed that I've seen before include "Bottom of the sea or river" , "(Garden) plot" , "Place for patient in hospital" , "Firmly settle" , "Sleeping place" .)