What does the cryptic crossword clue "Checks upset London police infiltrating Nazi organisation (5)" mean?

This cryptic clue uses wordplay to arrive at the answer. Visit the page for progressive hints — definition, wordplay type, and a full step-by-step explanation.

Checks upset London police infiltrating Nazi organisation (5)

Guardian Cryptic #29539 | 4 Down | 2024-11-13

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I haven't cracked this one yet — but the brilliant team at Fifteensquared have:

Reverse of MET (Metropolitan Police) in SS (Nazi organisation)

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