There's nothing in a trick to excite (6)
I believe the answer is:
arouse
'to excite' is the definition.
(I know that arouse is a more specific form of the action excite)
'there's nothing in a trick' is the wordplay.
'there's nothing' becomes 'o' (I've seen this in other clues).
'in' indicates putting letters inside.
'trick' becomes 'ruse' (I've seen this before).
'a'+'ruse'='aruse'
'o' put within 'aruse' is 'AROUSE'.
(Other definitions for arouse that I've seen before include "Stimulate or excite" , "Wake or stir up" , "Excite; wake from sleep" , "Incite or stimulate" , "Excite, awaken" .)