Crossword Genius

In a childish manner (10)

Ross

I think it could be either:

childishly

immaturely

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">in a childish manner</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I know this)</span><br/ ><br/ >This is the entire clue.<br/ ></span>

(Other definitions for childishly that I've seen before include "in puerile manner" , "In an immature fashion" , "Like baby" .)

I've seen this clue in The Times.
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