√ Register indicator clue crossword clue?

Out of many answers that will work, here is the 4 letter answer for the "Register indicator" crossword puzzle clue that appears in the daily newspaper the Chronicle of Higher Education crossword puzzle has been solved and the answer appears below...

After looking around and researching on google and bing, here is what I found! The answer for the "Register indicator clue"  

Several other answers are at your fingertips, just use the search at the top - CLEF

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