Slander when individual holds source of info (9)
I believe the answer is:
aspersion
'slander' is the definition.
('aspersion' can be a synonym of 'slander')
'when individual holds source of info' is the wordplay.
'when' becomes 'as'.
'individual' becomes 'person' ('person' can be a synonym of 'individual'**).
'holds' is an insertion indicator.
'source of' suggests taking the first letters.
The initial letter of 'info' is 'i'.
'person' enclosing 'i' is 'persion'.
'as'+'persion'='ASPERSION'
(Other definitions for aspersion that I've seen before include "Negative comment" , "Malicious remark" , "Defamatory suggestion" , "Cast this slur" , "Attack on the character" .)