Upset Albert in den at which one eats (6,5)

I believe the answer is:

dinner table

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'at which one eats' is the definition.
Although both the answer and definition are singular nouns, I cannot see how one could define the other.

'upset albert in den' is the wordplay.
'upset' is an anagram indicator.
'albert'+'in'+'den'='albertinden'
'albertinden' is an anagram of 'DINNER-TABLE'.

Can you help me to learn more?

(Another definition for dinner table that I've seen is " Where meals are served".)

I've seen this clue in The Irish Independent.

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