Crossword Genius

Tactful police admit unfortunately losing drug (10)

Ross

I believe the answer is:

diplomatic

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'tactful' is the definition.
(similar in meaning)

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for diplomatic that I've seen before include "Discreet" , "Tactful" .)

I've seen this clue in the Sydney Morning Herald.
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