Solve, as a problem (5)
I believe the answer is:
crack
(Other definitions for crack that I've seen before include "Narrow opening; joke" , "Witticism" , "snap" , "Drug - solve" , "Break; gap" .)
I believe the answer is:
crack
(Other definitions for crack that I've seen before include "Narrow opening; joke" , "Witticism" , "snap" , "Drug - solve" , "Break; gap" .)