Unusual action needed to consume cold tongue (7)

I haven't cracked this one yet — but the brilliant team at Times for the Times have:

Anagram [unusual] of ACTION containing [to consume] C (cold). This is the one I got wrong. Once again we have an obscure foreign word (Collins doesn’t even list it) clued as an anagram. When all the checkers were in place the answer had to be OCCITAN or OCCATIN. I chose the latter for no reason other than Latin ends -IN. I might as well have flipped a coin! Lexico: The medieval or modern language of Languedoc, including literary Provençal of the 12th–14th centuries.