Spoil one occasion near the sea (8)

I believe the answer is:

maritime

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'sea' is the definition.
Both the definition and answer are adjectives. Perhaps you can see an association between them that I can't see?

'spoil one occasion near' is the wordplay.
'spoil' becomes 'mar' (synonyms).
'one' becomes 'i' (Roman numeral).
'occasion' becomes 'time' (I've seen this in another clue).
'near' is a charade indicator (letters next to each other).
'mar'+'i'+'time'='MARITIME'

'the' is the link.

Can you help me to learn more?

(Other definitions for maritime that I've seen before include "Found near the sea" , "Of seafaring or shipping" , "Nautical" , "Bordering on the sea" , "Relating to the sea" .)

I've seen this clue in The Mirror.

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