Extreme letters from daubers (4)

I believe the answer is:

uber

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'extreme letters' is the definition.
I know nothing about this answer so I cannot tell whether it can be defined by this definition.

'from daubers' is the wordplay.
'from' says the answer is hidden in the clue.
'UBER' can be found hidden inside 'daubers'.

Can you help me to learn more?

(Other definitions for uber that I've seen before include "App-based alternative to taxis" , "Taxi company" .)

I've seen this clue in The Hindu.

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