Crossword Genius

For treatment, attain old type of drug? (9)

Ross

I believe the answer is:

antidotal

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'for treatment attain old type of drug?' is the definition.
I can't judge whether this defines the answer.

'for treatment attain old' is the wordplay.
'for treatment' is an anagram indicator (the anagram must be processed or treated).
'attain'+'old'='attainold'
'attainold' anagrammed gives 'ANTIDOTAL'.

Can you help me to learn more?

(Other definitions for antidotal that I've seen before include "remedy" , "something to deal with venom" .)

I've seen this clue in The Times.
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