Making certain call provides new basis for result (8)
I believe the answer is:
ensuring
'making certain' is the definition.
('ensure' can be a synonym of 'make certain')
'call provides new basis for result' is the wordplay.
I cannot really see how this works, but
'call' could be 'ring' ('ring' can be a synonym of 'call') and 'ring' is found within the answer.
'new' could be 'n' and 'n' is located in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for ensuring that I've seen before include "Maklng certain" , "Making certain" , "Making safe" .)