12 across
In
2000,
Spain
rejecting
port’s
account
(6)
In 2000, Spain rejecting port’s account (6)
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The definition is at the end of the clue.
How the clue works
Look at account at the end — that's your definition. Spain gives you E, tucked inside 2000 in Roman numerals (MM) to get MEM, then port RIO is reversed ("rejecting") to give OIR, and the two halves come together to make the answer.