Half-exceeded by edgy suppliers, resulting in an overabundance (6)
I believe the answer is:
excess
'an overabundance' is the definition.
(I know that excess is a type of overabundance)
'half-exceeded by edgy suppliers' is the wordplay.
'half' indicates taking half.
'by edgy suppliers' becomes 'ss' (I am not sure about this - if you are sure you should believe this answer much more).
'exceeded' cut in half is 'exce'.
'exce'+'ss'='EXCESS'
'resulting in' is the link.
Can you help me to learn more?
(Other definitions for excess that I've seen before include "more than enough" , "Surfeit; overindulgence" , "Amount that is more than is needed" , "Lack of moderation, in drinking say" , "Glut, superfluity" .)