Crossword Genius

Confirm a north-eastern shipping route (3,4)

Ross

I believe the answer is:

sea lane

'shipping route' is the definition.
(I've seen this before)

'confirm a north-eastern' is the wordplay.
'confirm' becomes 'seal' (I've seen this in another clue).
'north eastern' becomes 'NE' (abbreviation).
'seal'+'a'+'ne'='SEA LANE'

(Another definition for sea lane that I've seen is " marine passage".)

I've seen this clue in The Times.
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