Letters (4)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">letters</span>' is the definition.<br/ ><span class="explanation-format__explanation">(letters sent in the post or mail)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for mail that I've seen before include "Eg, letters" , "letter?" , "protective cover" , "Letters - armour" , "Chain armour" .)
(Other definitions for abcs that I've seen before include "Know these to be well versed - alphabetically?" , "12 [THINGS EASY]" , "guides ..." , "Know these letters to be well informed" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">letters</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">letters</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I know this)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Another definition for consonants that I've seen is " Letters".)