Noticeable hangover, totally drunk (5)

I believe the answer is:

overt

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

'noticeable' is the definition.
Both the definition and answer are adjectives. Maybe there's an association between them I don't understand?

'hangover totally drunk' is the wordplay.
'OVERT' is hidden in amongst the letters.
However, I am not sure how this is indicated.

Can you help me to learn more?

(Other definitions for overt that I've seen before include "Open and unconcealed" , "Open and candid" , "Conspicuous" , "Clear" , "Patent, evident" .)

I've seen this clue in The Hindu.

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