Maybe Leave voter's awfully poetic curse (11)
I believe the answer is:
eurosceptic
'maybe leave voter's' is the definition.
(those who voted to leave EU in the UK referendum)
'awfully poetic curse' is the wordplay.
'awfully' is an anagram indicator.
'poetic'+'curse'='poeticcurse'
'poeticcurse' is an anagram of 'EUROSCEPTIC'.
(Other definitions for eurosceptic that I've seen before include "One against being "ruled from Brussels"" , "type of politician" , "Cup tie score (anag) - Nigel Farage, perhaps" , "One opposed to closer links with our Continental neighbours" , "one against continental club?" .)