Improved quality of cane men then distributed (11)
I believe the answer is:
enhancement
'improved quality' is the definition.
(something that has been enhanced or improved)
'cane men then distributed' is the wordplay.
'distributed' is an anagram indicator.
'cane'+'men'+'then'='canementhen'
'canementhen' is an anagram of 'ENHANCEMENT'.
'of' is the link.
(Other definitions for enhancement that I've seen before include "Improving change" , "Boost, intensification" , "Heightening" , "this will improve things" , "What improves" .)