Even an expert can go to pieces (5)
I believe the answer is:
crack
This could be a double definition.
'even an expert' is the first definition.
'crack' can be an answer for 'expert' (I've seen this before). I'm not sure about the 'even an' bit.
'go to pieces' is the second definition.
(thesaurus)
'can' is the link.
Can you help me to learn more?
(Other definitions for crack that I've seen before include "Try" , "Brilliant" , "bang" , "Go for expert" , "Fracture" .)