Very high bird's nest? (4)

I believe the answer is:

soup

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'bird's nest?' is the definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.

'very high' is the wordplay.
'very' becomes 'so' (both can mean 'extremely').
'high' becomes 'up' (associated in meaning).
'so'+'up'='SOUP'

Can you help me to learn more?

(Other definitions for soup that I've seen before include "Stolen plate melted down" , "Photographic developer" , "Mulligatawny or borscht?" , "First course" , "Eg, minestrone" .)

I've seen this clue in The Sun.

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