Old boy's drunk and full of claret? (6)

I believe the answer is:

bloody

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

'and full of claret?' is the definition.
I can't tell whether this defines the answer.

'old boy's drunk' is the wordplay.
'drunk' indicates an anagram.
'old'+'boy'='oldboy'
'oldboy' anagrammed gives 'BLOODY'.

Can you help me to learn more?

(Other definitions for bloody that I've seen before include "Cruel, murderous" , "Gory" , ""____ but unbowed"" .)

I've seen this clue in the Sydney Morning Herald.

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