One of the early invaders of Ireland (6)

I believe the answer is:

viking

'one of the early invaders of ireland' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for viking that I've seen before include "Scandinavian seafarer" , "Norse trader, pirate" , "Ancient Scandinavian adventurer" , "Norseman" , "Seafaring Scandinavian" .)

I've seen this clue in the Irish Times (Simplex) and The Irish Times.

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