Engrossed in old wine (6)

I believe the answer is:

intent

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'engrossed' is the definition.
(I know that engrossed can be written as intent)

'in old wine' is the wordplay.
'old wine' becomes 'tent' (type of Spanish wine. I am not sure about the 'old' bit.).
'in'+'tent'='INTENT'

Can you help me to learn more?

(Other definitions for intent that I've seen before include "With mind fixed on purpose, concentrated" , "Earnest, purpose" , "wrapped up" , "Purpose under canvas" , "Design, aim" .)

I've seen this clue in The Sun.

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