Cryptic crossword clue
Sodium converted into alumin­ium is helping right away with public ownership 15

The most common and most likely answer to this crossword clue is the 15 letter word NATIONALISATION

I've seen this crossword clue in The Guardian
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The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.
This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.

What does NATIONALISATION mean?

NATIONALISATION noun
  1. The act or process of nationalising:

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