Get excited at somersault (4)
I believe the answer is:
flip
I believe this is a double definition.
'get excited' is the first definition.
(I've seen this in another clue)
'somersault' is the second definition.
(synonyms)
'at' acts as a link.
(Other definitions for flip that I've seen before include "Toss over; egg-nog" , "Turn quickly over; sort of chart" , "Somersault; impertinent" , "Go crazy - other side" , "hit the roof" .)