Crossword Genius

What could give cinema a darn toot? Where’s Yosemite Sam when you need him? (8,7)

Ross

I believe the answer is:

animated cartoon

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

'you need him?' is the definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.

'what could give cinema a darn toot? where's yosemite sam' is the wordplay.
'cinema a darn toot' anagrams to 'ANIMATED CARTOON'.
However, I am not sure how this is indicated.

'when' is the link.

Can you help me to learn more?

(Other definitions for animated cartoon that I've seen before include "Film" , "Sleeping Beauty, perhaps" .)

I've seen this clue in The Independent.
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