Relating to acid derived from gall nuts put into melting ice (7)

I believe the answer is:

ellagic

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'relating to acid derived' is the definition.
I can't judge whether this definition defines the answer.

'gall nuts put into melting ice' is the wordplay.
'nuts' indicates an anagram (nuts can mean crazy).
'put into' indicates putting letters inside.
'melting' indicates anagramming the letters.
'gall' anagrammed gives 'llag'.
'ice' anagrammed gives 'eic'.
'llag' put within 'eic' is 'ELLAGIC'.

'from' acts as a link.

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