No part of nutritious liquid or soup is leak-proof (9)

I believe the answer is:

nonporous

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'leak-proof' is the definition.
I can't tell whether this defines the answer.

'no part of nutritious liquid or soup' is the wordplay.
'part of' says to take the initial letters (I've seen 'part' mean this).
'liquid' indicates an anagram.
The initial letter of 'nutritious' is 'n'.
'or'+'soup'='orsoup'
'orsoup' with letters rearranged gives 'porous'.
'no'+'n'+'porous'='NONPOROUS'

'is' acts as a link.

Can you help me to learn more?

I've seen this clue in The Hindu.

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