Number taken from sixty (4)
I believe the answer is:
nine
This could be a double definition.
'number' is the first definition.
(nine is a kind of number)
'sixty' is the second definition.
The definition and answer can be both quantities as well as being singular nouns.
Maybe they are linked in a way I don't understand?
'taken from' is the link.
(Other definitions for nine that I've seen before include "Three squared" , "Square number" , "One over the eight" , "One's married partner" , "Square root of 81" .)