Enthuse at dance party (4)
I believe the answer is:
rave
I believe this clue is a double definition.
'enthuse' is the first definition.
(I've seen this in another clue)
'dance party' is the second definition.
(rave is a type of dance event)
'at' acts as a link.
(Other definitions for rave that I've seen before include "Rant about an all-night dance party?" , "Rapturous" , "Laudatory sort of review - quite a rant" , "Illegal party; talk madly" , "Talk wildly and angrily" .)