Crossword Genius

Wow, a drunk in sojourn — illegal traveller! (8)

Ross

I believe the answer is:

stowaway

'illegal traveller' is the definition.
(I've seen this before)

'wow a drunk in sojourn' is the wordplay.
'drunk' indicates an anagram.
'in' is an insertion indicator.
'sojourn' becomes 'stay' (I've seen this before).
'wow'+'a'='wowa'
'wowa' is an anagram of 'owaw'.
'owaw' put into 'stay' is 'STOWAWAY'.

(Other definitions for stowaway that I've seen before include "Hider on board" , "One in a hold" , "One hiding on ship" , "Unauthorised passenger" , "Travel secretly" .)

I've seen this clue in The Guardian.
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