Acid oddly cold for sun treatment (8)

I believe the answer is:

scornful

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'acid' is the definition.
Both the answer and definition are adjectives. Maybe they are linked in a way I don't understand?

'oddly cold for sun treatment' is the wordplay.
'oddly' indicates alternate letters (letters in the odd-numbered positions are used).
'treatment' indicates anagramming the letters.
The alternate letters of 'cold' are 'cl'.
'cl'+'for'+'sun'='clforsun'
'clforsun' with letters rearranged gives 'SCORNFUL'.

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(Other definitions for scornful that I've seen before include "Disdainful, contemptuous" , "Openly contemptuous" , "sneering?" , "Showing contempt for" , "Contemptuous or derisory" .)

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

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