Where the writer takes a dip? (7)
I believe the answer is:
inkwell
'where the writer takes a dip?' is the definition.
Although both the answer and definition are singular nouns, I cannot see 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 "Container sunk unto a desk of old" , "source for old-fashioned writer" , "Old desktop pot" , "Writing fluid holder" , "It's used by writers" .)