The most common and most likely answer to this crossword clue is the 12 letter word COMMENSURATE
I've seen this crossword clue in The Daily Telegraph
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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 COMMENSURATE mean?
COMMENSURATE verb- To reduce to a common measure.
- To proportionate; to adjust.
- Of a proportionate or similar measurable standard.
- Describing a crystal in which every atom or molecule is placed in the same relative position