External route maybe (5)

I believe the answer is:

outer

'external' is the definition.
(similar in meaning)

'route maybe' is the wordplay.
'maybe' indicates anagramming the letters.
'route' anagrammed gives 'OUTER'.

(Other definitions for outer that I've seen before include "External; part of archery target" , "On the periphery" , "Objective" , "Archer's shot" , "External; peripheral" .)

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

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