The Crossword Centre Clue-Writing Competition

CCCWC April competition voters’ comments
 
Clue no. 9: By end of 'tomo' Dyson mostly sure about long-distance travels? (7)

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A clue to ODYSSEY.
3 comments refer to this clue (from 3 competitors, 0 others)

Here is the text

Comments on the clue
1.I don't get this. Is "tomo" a made-up abbreviation for tomorrow?
2.Odyssey is singular so why not just 'travel'? And what is tomo?
3."tomo" and Dyson are a bit clumsy