Where His Nibs used to take a dip? (7)
I believe the answer is:
inkwell
'where his nibs used to take a dip?' is the definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.
This is all the clue.
Can you help me to learn more?
(Other definitions for inkwell that I've seen before include "Desk reservoir" , "Reservoir for writing fluid" , "Writing fluid holder" , "Old desktop pot" , "Container sunk unto a desk of old" .)