Knowingly involved in making baseless complaints legal (9)
I believe the answer is:
complicit
'knowingly involved in' is the definition.
I don't know anything about this answer so I cannot judge whether it can be defined by this definition.
'baseless complaints legal' is the wordplay.
'baseless complaints' becomes 'comp' (I am not sure about this - if you are sure you should believe this answer much more).
'legal' becomes 'licit' (similar in meaning).
'comp'+'licit'='COMPLICIT'
'making' is the link.
Can you help me to learn more?
(Other definitions for complicit that I've seen before include "Being involved in wrongdoing" , "Conniving" , "Involved with others in illegality" , "Sharing guilt" , "Conspiring in illegal activity" .)