Crossword Genius

Informal expression (13)

Ross

I believe the answer is:

colloquialism

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">informal expression</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 colloquialism that I've seen before include "Word used in familiar speech" , "Expression used in informal conversation" , "Informal word or phrase" .)

I've seen this clue in The Guardian.
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