Stupidly go out with ex around noon for food (8)

I believe the answer is:

oxtongue

This might be a double definition.

'stupidly go out with ex around noon' is the first definition.
Although both the answer and definition are singular nouns, I can't see how one could define the other.

'food' is the second definition.

'for' acts as a link.

I've seen this clue in The Independent.

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