Crossword Genius

The source of a writer's material (6)

Ross

I believe the answer is:

inkpot

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This might be a double definition.

'the source' is the first definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

'a writer's material' is the second definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Maybe they are linked in a way I don't understand?

'of' acts as a link.

Can you help me to learn more?

(Other definitions for inkpot that I've seen before include "Source for old writer" , "Here perhaps blue fluid" , "Vessel for writing fluid" , "Topper-up for old writer" , "that may assist writer" .)

I've seen this clue in The Globe and Mail.
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