Crossword Genius

The greatest and biggest distributors do (9)

Ross

I believe the answer is:

uttermost

I'm a little stuck... Click here to teach me more about this clue!

This clue could be a double definition.

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

'biggest distributors do' is the second definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.

'and' is the link.

Can you help me to learn more?

(Other definitions for uttermost that I've seen before include "Extreme" , "best" , "at the furthest limit" , "Last" , "The furthest point or degree" .)

I've seen this clue in the Evening Standard.
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