Withdrawn and bored about hangover on vacation (6)

I believe the answer is:

shrunk

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'withdrawn' is the definition.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

'bored about hangover on vacation' is the wordplay.
'bored' becomes 'sunk' (I am not sure about this - if you are sure you should believe this answer much more).
'about' indicates putting letters inside.
'on vacation' says to hollow out the word (remove centre letters).
'hangover' with its middle taken out is 'hr'.
'sunk' going around 'hr' is 'SHRUNK'.

'and' acts as a link.

Can you help me to learn more?

I've seen this clue in The Independent.

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