Part of a royal seaport in Portugal (4)

I believe the answer is:

faro

'in portugal' is the definition.
(I know that Faro located in the administrative territorial entity Portugal)

'part of a royal seaport' is the wordplay.
'part' indicates a hidden word.
'FARO' can be found hidden inside 'of a royal seaport'.

(Other definitions for faro that I've seen before include "Portuguese city" , "Card game - Algarve port" , "Algarve seaport" , "Atlantic port" , "City in Portugal's Algarve" .)

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