Confidence trickster's aim spells trouble (2-2)
I believe the answer is:
to-do
'trouble' is the definition.
(thesaurus)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for to-do that I've seen before include "Fuss or commotion" , "Quarrel" , "Spot of bother" , "Flap" , "Bustle" .)