Turns up, before Easter welcoming most of the journalists with vision (6)

I believe the answer is:

tunnel

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'vision' is the definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for tunnel that I've seen before include "Passage below ground" , "Burrow" , "Sight defect" , "Passageway under something" , "An underground route" .)

I've seen this clue in the Irish Times (Crosaire) and the Irish Times.

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