No longer a single charge. Is that clear? (9)
I believe the answer is:
exonerate
'that clear?' is the definition.
(thesaurus)
'no longer a single charge' is the wordplay.
'no longer' becomes 'ex'.
'a single' becomes 'one' ('one' can be a synonym of 'single').
'charge' becomes 'rate' (rate is a kind of charge**).
'ex'+'one'+'rate'='EXONERATE'
'is' acts as a link.
(Other definitions for exonerate that I've seen before include "Justify" , "Acquit" , "free of charge" , "Clear of blame" , "let off the hook" .)