Insurance statistician (7)
I believe the answer is:
actuary
'insurance statistician' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for actuary that I've seen before include "Specialist who calculates probabilities for insurance companies" , "Risk-assessor" , "Accounts statistician" , "Person using statistics to calculate insurance premiums" , "Expert in statistics who calculates insurance probabilities" .)