Makes improvements re the shapes (7)
I believe the answer is:
reforms
'makes improvements' is the definition.
'reforms' can be an answer for 'improvements' (reform is a kind of improvement). I am unsure of the 'makes' bit.
're the shapes' is the wordplay.
'the shapes' becomes 'forms' ('form' can be a synonym of 'shape').
're'+'forms'='REFORMS'
Can you help me to learn more?
(Other definitions for reforms that I've seen before include "Adjustments" , "Changes for improvement" , "Makes changes" , "Mends ways, abandons badness" .)