Business letters? (3)
I believe the answer is:
inc
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">business letters?</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>
(Another definition for inc that I've seen is " Including (abbrev.)".)
I've seen this clue in the LA Times.
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