Total eclipse's initial intermingling (6)
I believe the answer is:
entire
'total' is the definition.
(I know that total can be written as entire)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for entire that I've seen before include "Whole; absolute" , "Unharmed - total" , "With no part left out" , "Full, intact" , "in one piece" .)