Cryptic crossword clue
No right to get Chemistry, say, without one's submission 12

The most common and most likely answer to this crossword clue is the 12 letter word ACQUIESCENCE

I've seen this crossword clue in The Times
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The straight part
We know that "submission" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case submission = acquiescence.
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 ACQUIESCENCE mean?

ACQUIESCENCE noun
  1. A silent or passive assent or submission, or a submission with apparent content, distinguished from avowed consent on the one hand, and on the other, from opposition or open discontent; quiet satisfaction.
  2. Inaction, passivity, or neglect to take legal action when it is called for in order to assert, preserve, or safeguard a right, and which inaction implies the abandonment of said right.

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