Crossword Genius

Sick ma lost? Very nearly! (6)

Ross

I believe the answer is:

almost

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'very nearly' is the definition.
(I've seen this in another clue)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for almost that I've seen before include "Well-nigh" , "As good as" , "Not totally" , "Nearly, not quite" , "practically" .)

I've seen this clue in The Sun.
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