The —, powerful current caused by conflicting tides around the Shetland and Orkney Islands (5)

I believe the answer is:

roost

(Other definitions for roost that I've seen before include "Birds' resting place" , "(Of birds) settle for rest" , "(Bird) settle for sleep" , "unwelcome to come home to?" , "Bat's resting place" .)

I've seen this clue in The Mirror.

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