Understanding how to be avaricious? (8)
I believe the answer is:
grasping
I believe this clue is a double definition.
'understanding' is the first definition.
(to grasp something is to understand it)
'to be avaricious?' is the second definition.
('grasping' can be a synonym of 'avaricious')
'how' is the link.
(Other definitions for grasping that I've seen before include "avaricious attitude" , "Holding" , "Acquisitive - understanding" , "Gangs rip, being greedy" , "Miserly; seizing" .)