Crossword Genius

Humorous drawing of box containing nothing (7)

Ross

I believe the answer is:

cartoon

'humorous drawing' is the definition.
(I've seen this before)

I can't explain the remainder of the clue.

(Other definitions for cartoon that I've seen before include "Amusing or satirical drawing" , "Jokey drawing" , "Humorous sketch" , "Animated drawing" , "eg 'Tom & Jerry'" .)

I've seen this clue in The Times.
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