Crossword Genius

Spooner's game escapade is material for artists (9,5)

Ross

I believe the answer is:

cartridge paper

I'm a little stuck... Click here to teach me more about this clue!

'spooner's game escapade' is the definition.
I can't tell whether this definition defines the answer.

'material for artists' is the wordplay.
I cannot quite understand how this works, but
'material' could be 'paper' (paper is a kind of material) and 'paper' is found within the answer.
The remaining letters 'cartridge' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

'is' acts as a link.

Can you help me to learn more?

(Another definition for cartridge paper that I've seen is " Stiff material for drawing on".)

I've seen this clue in The Independent.
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