Secure form of saving (6)
I believe the answer is:
rescue
'saving' is the definition.
(I know that saving can be written as rescue)
'secure form' is the wordplay.
'form' indicates anagramming the letters (a different form of the same letters).
'secure' with letters rearranged gives 'RESCUE'.
'of' acts as a link.
(Other definitions for rescue that I've seen before include "Being presumptuous" , "Free from danger or captivity" , "Pull from danger" , "Free - recovery" , "Save - deliver" .)