Cryptic crossword clue
Policeman retains criminal file, noting contents removed: act of corruption 8

The most common and most likely answer to this crossword clue is the 8 letter word DEFILING

I've seen this crossword clue in Financial Times
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The cryptic/wordplay part
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This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
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What does DEFILING mean?

DEFILING verb
  1. To make unclean, dirty, or impure; soil; befoul.
  2. To vandalize or add inappropriate contents to something considered sacred or special; desecrate
  3. To deprive or ruin someone's (sexual) purity or chastity, often not consensually; stain; tarnish; mar; rape
DEFILING verb
  1. To march in a single file; to file.

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