Wendy —, 1984 Olympic 3,000m silver medallist (3)

I believe the answer is:

sly

(Other definitions for sly that I've seen before include "Devious and furtive" , "'Crafty, cunning (3)'" , "Devious, cunning" , "Cunning, foxy" , "Unpleasantly cunning and secretive" .)

I've seen this clue in The Mirror.

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