Wartime naval base in the Orkney Islands (5,4)

I believe the answer is:

scapa flow

(Other definitions for scapa flow that I've seen before include "harbour" , "Wartime naval base in Orkney" , "Landlocked anchorage in the Orkney Islands" , "Former naval base in the Orkney Islands" .)

I've seen this clue in The Times and The Sunday Times.

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