Regular correspondent (3,3)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">regular correspondent</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for pen pal that I've seen before include "friendly writer" , "American friend via correspondence" , "A friendly correspondent" , "Friend who communicates in writing" , "juvenile writer" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">regular correspondent</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>