Complex actuarially, giving accurate result. (5)
I believe the answer is:
exact
'accurate result' is the definition.
Although both the answer and definition are verbs in their base form, I don't see how they can define each other.
'complex actuarially' is the wordplay.
'EXACT' is hidden within the letters.
However, I'm not sure how this is indicated.
'giving' acts as a link.
Can you help me to learn more?
(Other definitions for exact that I've seen before include "Meticulous" , "Absolutely accurate or correct" , "Precise and strictly correct" , "Spot on, precise" , "As a right, demand" .)