US President leads a dance (5)
I believe the answer is:
polka
'dance' is the definition.
(polka is a kind of dance)
'us president leads a' is the wordplay.
'us president' becomes 'polk' (I've seen this in other clues).
'leads' says to put letters next to each other.
'polk'+'a'='POLKA'
(Other definitions for polka that I've seen before include "Dot may be associated with this" , "a merry dance?" , "Lively dance (but dotty?)" , "Bohemian movement" , "Bohemian dance with three steps and a hop" .)