Miss sea off Algiers (4)

I believe the answer is:

girl

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'miss' is the definition.
('girl' can be a synonym of 'miss')

I don't understand the remainder of the clue.

(Other definitions for girl that I've seen before include "Lass" , "Young lady" , "A young female" , "One of 8 [LASSES]" , "Maidservant" .)

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

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