Crossword Genius

Very satisfied about oral tissues (4)

Ross

I believe the answer is:

smug

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'very' is the definition.
Both the definition and answer are adjectives. Perhaps you can see a link between them that I don't see?

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for smug that I've seen before include "Unctuous" , "Self-satisfied and vain" , "Irritatingly self-satisfied" , "Like a stuffed shirt" , "Showing excessive self-pride" .)

I've seen this clue in The Hindu.
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