Burst out laughing, maybe, about case made so poorly (6)
I believe the answer is:
crease
'burst out laughing' is the definition.
I can't tell whether this defines the answer.
'about case made so poorly' is the wordplay.
'about' means one lot of letters goes inside another.
'made so poorly' becomes 're' (I am not sure about this - if you are sure you should believe this answer much more).
'case' enclosing 're' is 'CREASE'.
'maybe' acts as a link.
Can you help me to learn more?
(Other definitions for crease that I've seen before include "Cricket pitch marking" , "Fold - wrinkle" , "Folded line" , "Fold; batsman's position" , "Wrinkle or pressed line" .)