Crossword Genius

Memo header (4)

Ross

I believe the answer is:

attn

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">memo header</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>

I've seen this clue in the Universal, the USA Today, The Wall Street Journal, the LA Times and The New York Times.
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