Look after harbour (5)

I believe the answer is:

nurse

This clue is a double definition.

'look after' is the first definition.
(thesaurus)

'harbour' is the second definition.
(I've seen this before)

(Other definitions for nurse that I've seen before include "Medical worker" , "Child minder" , "One ministering to the sick" , "Hospital employee" , "Carer for the sick; shark" .)

I've seen this clue in The Telegraph, The Times and The Sun.

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