Note black Republican brought to First Lady (5)
I believe the answer is:
breve
'note' is the definition.
(thesaurus)
'black republican brought to first lady' is the wordplay.
'black' becomes 'b' (as in pencil classifications).
'republican' becomes 'r' (abbreviation).
'brought to' is a charade indicator (letters next to each other).
'first lady' becomes 'eve' (I've seen this before).
'b'+'r'+'eve'='BREVE'
(Other definitions for breve that I've seen before include "Long musical note" , "Note equivalent to four minims" , "Note with the time value of eight crotchets" , "(In music) long note" , "Accent placed over a vowel" .)