Gave teacher wrong date (7)
I believe the answer is:
donated
'gave' is the definition.
(donating is a kind of giving)
'teacher wrong date' is the wordplay.
'teacher' becomes 'don' (don is a kind of teacher).
'wrong' is an anagram indicator.
'date' with letters rearranged gives 'ated'.
'don'+'ated'='DONATED'
(Other definitions for donated that I've seen before include "Given" , "Gave" , "Presented" .)