Dont spare what printers use - dip into this (7)
I believe the answer is:
inkwell
'dont spare what printers use dip into this' is the definition.
The definition suggests a singular noun which matches the answer.
'into this' is the wordplay.
I cannot quite understand how this works, but
'into' could be 'in' and 'in' is found in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for inkwell that I've seen before include "Old school desk feature" , "Container sunk unto a desk of old" , "Small pot for holding writing fluid" , "Container for writing fluid" , "It's used by writers" .)