Crossword Genius

Become invalid (6)

Ross

I believe the answer is:

expire

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">become invalid</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>

(Other definitions for expire that I've seen before include "Come to an end; die" , "Run out (of time?)" , "Die or lapse" , "Die, give out" , "Breathe out or pass away" .)

I've seen this clue in The Guardian.
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