It gets one’s writing to flow? (3)
I believe the answer is:
ink
This could be a double definition.
'it gets one's' is the first definition.
The definition suggests a singular noun which matches the answer.
'to flow?' is the second definition.
The answer and definition can be both related to change as well as being verbs in their base form.
Perhaps there's an association between them I don't understand?
'writing' is the link.
(Other definitions for ink that I've seen before include "Pen fluid" , "Pen's contents" , "form of writing" , "Cuttlefish's secretion" , "Liquid from a squid" .)