On the outside (8)

I think it could be either:

exterior

external

'on the outside' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for external that I've seen before include "Belonging to the outside" , "abroad" , "Outer" , "Lying outside" , "Relating to the outside" .)

I've seen this clue in The Irish Times, the Sydney Morning Herald and The Guardian.

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