Sure to mess up trick (4)
I believe the answer is:
ruse
'trick' is the definition.
(I've seen this before)
'sure to mess up' is the wordplay.
'to mess up' indicates anagramming the letters (I've seen 'messed up' mean this).
'sure' with letters rearranged gives 'RUSE'.
(Other definitions for ruse that I've seen before include "Sure to be a plot" , "Ploy, artifice" , "Artful ploy" , "Sue to be a ploy" , "Sure its a strange deception" .)