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Greatest, but I'm lost without leaders (6)

Ross

I believe the answer is:

utmost

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

I don't understand the rest of the clue.

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(Other definitions for utmost that I've seen before include "Farthest" , "last" , "Maximum effort" , "Extremest" , "The greatest possible degree" .)

I've seen this clue in The Guardian.
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