Fate who spins the thread of life (6)
I believe the answer is:
clotho
'fate who spins the thread of life' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for clotho that I've seen before include "female controlling destiny" , "puff-adder" , "One of the three Fates (she spins!)" , "Greek goddess of fate who spins the thread of life" , "Fate who spun thread of life" .)