Exactly like a llama? (8,5)

I believe the answer is:

spitting image

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'llama?' is the definition.
Both the definition and answer are singular nouns.
Maybe there's an association between them I don't understand?

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for spitting image that I've seen before include "Exact likeness" , "exact copy" , "show on TV" , "Exact double" , "Perfect likeness" .)

I've seen this clue in the Sydney Morning Herald.

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