Routed in a roundabout way as a diversion (6)

I believe the answer is:

detour

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'a diversion' is the definition.
(I've seen this before)

'routed in a roundabout way' is the wordplay.
'routed' can be anagrammed to 'DETOUR'.
Though, I'm not clear how this is indicated.

'as' is the link.

Can you help me to learn more?

(Other definitions for detour that I've seen before include "Diversion" , "Deviation from usual course" , "Deviation from direct course" , "Deviate from planned route, go around" , "Routed (anag.)" .)

I've seen this clue in The Globe and Mail.

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