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"detour" is also used as a crossword clue. If that's what you saw, the answer is often diversion (9 letters).
Definitions
Indirect route taken to avoid a blockage or reach a place another way.
Word origin
Borrowed from French détour, from détourner (“turn away”).
Used in a sentence
“On the third day I made a detour westward to avoid the country of the Band-lu, as I did not care to be detained by a meeting with To-jo.”
“Petrelis detoured away from southern activities to visit Chicago and help draw attention to lesbian, gay and AIDS issues during the Illinois primary March 16.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“Alternate route”6 letters
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