Crossword Genius

Mistakes - letting European escape - by British spies: they prompt reflections (7)

Ross

I believe the answer is:

mirrors

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'reflections' is the definition.
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(Other definitions for mirrors that I've seen before include "Reflects" , "Reflective pieces of glass" , "Reflections" , "Shows a reflection" .)

I've seen this clue in The Independent.
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