Crossword Genius

OK (2-5)

Ross

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">ok</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>

(Other definitions for go-ahead that I've seen before include "Pioneering (green light?)" , "Up-and-coming - authorisation" , "Enterprisingly progressive" , "Permission to proceed" , "Enterprising" .)

I've seen this clue in The Guardian and The Telegraph.
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