Have the temerity to bring in European regulation where Dover is (8)
I believe the answer is:
delaware
'where dover is' is the definition.
(Dover is the capital of Delaware)
'have the temerity to bring in european regulation' is the wordplay.
'have the temerity' becomes 'dare' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'to bring in' is an insertion indicator.
'european' becomes 'E' (abbreviation e.g. EU).
'regulation' becomes 'law' (I've seen this before).
'e'+'law'='elaw'
'dare' enclosing 'elaw' is 'DELAWARE'.
Can you help me to learn more?
(Other definitions for delaware that I've seen before include "Atlantic state of the US" , "American state, capital Dover" , "This state strangely awed Lear" , "The First State (to ratify the US constitution)" , "The Diamond State, capital Dover" .)