Tested chopper on the rise, likely to explode? (8)
I believe the answer is:
Here is my best explanation:
'tested' is the definition.
('examine' can be a synonym of 'test')
'chopper on the rise likely to explode?' is the subsidiary indication.
'chopper' becomes 'axe' (I've seen this before).
'on the rise' shows that the letters should be reversed in order.
'likely to explode?' becomes 'mined'.
'axe' backwards is 'exa'.
(Other definitions for examined that I've seen before include "Looked into something closely", "Questioned closely", "Tested or scrutinised", "Questioned, tested", "Observed and checked out", "I need Max to be tested", "Considered in detail", "Did test", "Scrutinised" and "Inspected, studied".)