Crossword Genius

Marine area – you could get tan for once (10)

Ross

I believe the answer is:

oceanfront

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'marine area you' is the definition.
The definition suggests a singular noun which matches the answer.

'get tan for once' is the wordplay.
'tan for once' can be anagrammed to 'OCEANFRONT'.
However, I am not clear how the anagram is indicated.

'could' is the link.

Can you help me to learn more?

I've seen this clue in The Guardian.
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