Improved in quality (8)
'improved in quality' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for enhanced that I've seen before include "Improved or increased the value" , "Heightened" , "Sexed-up" , "And hence? (anag)" , "Increased in value or quality" .)
(Other definitions for enriched that I've seen before include "Improved in quality - made wealthy" , "Made wealthier" .)