Uncle Vernon's very able (6)

I believe the answer is:

clever

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

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

'uncle vernon's very' is the wordplay.
'CLEVER' is hidden within the letters.
But, I'm uncertain how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for clever that I've seen before include "Intelligent - skilful" , "Quick to learn and understand" , "Knowledgeable" , "Smart or shrewd" , "easy to teach?" .)

I've seen this clue in the Evening Standard.

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