Circulate obscure URL, lawlessly, pertaining to acid (6)

I believe the answer is:

acetic

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'to acid' is the definition.
(acetic acid is a kind of acid)

I don't understand the rest of the clue.

(Other definitions for acetic that I've seen before include "Tasting like vinegar" , "The acid in vingear" , "Saucy'" , "Vinegary acid" , "Type of acid derived from vinegar" .)

I've seen this clue in The Irish Times.

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