In Dover, a teacher consumed too much (7)
I believe the answer is:
overate
'consumed too much' is the definition.
(I've seen this before)
'in dover a teacher' is the wordplay.
'in' says the answer is hidden in the clue.
'OVERATE' can be found hidden inside 'dover a teacher'.
(Other definitions for overate that I've seen before include "consumed too much" , "got stuffed" , "Gormandised" , "Binged, glutted" .)