Used a tart mixture fully charged (9)
I believe the answer is:
saturated
'fully charged' is the definition.
The definition and answer can be both related to change as well as being past participle verbs.
Perhaps you can see a link between them that I can't see?
'used a tart mixture' is the wordplay.
'mixture' indicates anagramming the letters.
'used'+'a'+'tart'='usedatart'
'usedatart' with letters rearranged gives 'SATURATED'.
Can you help me to learn more?
(Other definitions for saturated that I've seen before include "Drenched" , "Extremely wet" , "Thoroughly soaked" , "dripping" , "Sodden" .)