Change inn around, improving (9)
I believe the answer is:
enhancing
'improving' is the definition.
(enhancing is a kind of improving)
'change inn around' is the wordplay.
'around' indicates anagramming the letters.
'change'+'inn'='changeinn'
'changeinn' is an anagram of 'ENHANCING'.
(Other definitions for enhancing that I've seen before include "Intensifying" , "Improving the value of (something)" , "Making more attractive" , "Improving the quality (of something)" , "Adding something extra to make it better" .)