Came up out of turn to cause excitement (6)
I believe the answer is:
arouse
'excitement' is the definition.
(I've seen this before)
'came up out of turn' is the wordplay.
'came up' becomes 'arose' (I've seen this before).
'out of' means one lot of letters goes inside another (some letters on the outside of others).
'turn' becomes 'u' (a 'U-turn' is a kind of turn).
'arose' going around 'u' is 'AROUSE'.
'to cause' acts as a link.
(Other definitions for arouse that I've seen before include "Galvanize" , "Evoke (a feeling)" , "Turn on" , "Set off" , "Waken up or stimulate feeling" .)