Swede regularly entered Portugal (4)

I believe the answer is:

neep

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'swede' is the definition.
Both the answer and definition are singular nouns.
Maybe you can see a link between them that I can't see?

'regularly entered portugal' is the wordplay.
'regularly' indicates alternate letters (regularly take one letter, leave next etc.).
'portugal' becomes 'p' (common abbreviation eg on car number plates).
The alternating letters of 'entered' are 'nee'.
'nee'+'p'='NEEP'

Can you help me to learn more?

(Other definitions for neep that I've seen before include "Root" , "(Scottish) turnip" , "Scots turnip" , "Scots veg" , "vegetable in Scotland" .)

I've seen this clue in The Independent.

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