Male in fancy red coat, US politician (8)
I believe the answer is:
democrat
'us politician' is the definition.
(I've seen this before)
'male in fancy red coat' is the wordplay.
'male' becomes 'm' (common abbreviation).
'in' means one lot of letters goes inside another.
'fancy' indicates an anagram.
'red'+'coat'='redcoat'
'redcoat' with letters rearranged gives 'deocrat'.
'm' going into 'deocrat' is 'DEMOCRAT'.
(Other definitions for democrat that I've seen before include "American politician" , "One advocates government by the people's elected representatives" , "US political party supporter" , "Believer in popular government" , "One who believes in government by the whole people" .)