An oily sea-fish (8)

I believe the answer is:

mackerel

(Other definitions for mackerel that I've seen before include "Food fish related to tuna" , "Edible fish" , "Marine food fish" , "Food fish with a blue-green back" , "Oily food fish" .)

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

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