Early Hanoverian with hint of total determination (4)
I believe the answer is:
grit
'determination' is the definition.
(grit can mean determination or tenacity)
'early hanoverian with hint of total' is the wordplay.
'early hanoverian' becomes 'gri' (I can't justify this - if you can you should believe this answer much more).
'with' means one lot of letters go next to another.
'hint of' suggests taking the first letters.
The initial letter of 'total' is 't'.
'gri'+'t'='GRIT'
Can you help me to learn more?
(Other definitions for grit that I've seen before include "Coarse stone or sand" , "lamb" , "Small hard particles - courage" , "Determination - which is found on winter roads" , "Gumption or small pieces of stone" .)