Crossword Genius

Such food as the first person sold out of? (5)

Ross

I believe the answer is:

solid

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'such food' is the definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.

'the first person sold out of?' is the wordplay.
'the first person' becomes 'I' (first-person pronoun).
'out of?' indicates anagramming the letters.
'i'+'sold'='isold'
'isold' is an anagram of 'SOLID'.

'as' acts as a link.

Can you help me to learn more?

(Other definitions for solid that I've seen before include "Reliable - substantial - pure" , "Firm - substantial" , "Shape with three dimensions" , "Concrete or reilable" , "Reliable - strong" .)

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