You are reportedly holding certain person taking a lot of interest (6)
I believe the answer is:
usurer
'person taking a lot of interest' is the definition.
(I've seen this before)
'you are reportedly holding certain' is the wordplay.
'are reportedly' shows a homophone (sound like).
'holding' means one lot of letters go next to another.
'certain' becomes 'surer' (I can't justify this - if you can you should believe this answer much more).
'you' sounds like 'u'.
'u'+'surer'='USURER'
Can you help me to learn more?
(Other definitions for usurer that I've seen before include "Moneylender who charges very high interest" , "Grasping money-lender" , "Unrestrained money lender" , "Shylock, for example" , "loan-shark" .)