Carp at sea by island: this one? (5)

I believe the answer is:

capri

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'this one?' is the definition.
The definition suggests a singular noun which matches the answer.

'carp at sea by island' is the wordplay.
'at sea' indicates an anagram.
'by' means one lot of letters go next to another.
'island' becomes 'i'.
'carp' anagrammed gives 'capr'.
'capr'+'i'='CAPRI'

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(Other definitions for capri that I've seen before include "found in Tyrrhenian location" , "Italian resort island, once home to Gracie Fields" , "Old Ford model - Italian island" , "popular resort" , "Italian isle" .)

I've seen this clue in The Sun.

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