Crossword Genius

Legion to become more insignificant? (9)

Ross

I believe the answer is:

countless

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'legion' is the definition.
(I've seen this before)

I can't explain the rest of the clue.

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(Other definitions for countless that I've seen before include "Untold" , "Innumerable" , "Legion seeming to be" , "Infinite" , "not so important" .)

I've seen this clue in The Times.
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