Crossword Genius

To a very great extent (8)

Ross

I think it could be either:

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8

2,3

mightily

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">to a very great extent</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>

(Another definition for mightily that I've seen is " To a very great extent".)

I've seen this clue in The Times, The Guardian, The Telegraph and the Irish Times (Simplex).
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