Cheat ex-Police man (5)

I believe the answer is:

sting

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This clue could be a double definition.

'cheat ex' is the first definition.
'sting' can be an answer for 'cheat' (I've seen this in another clue). I am unsure of the 'ex' bit.

'police man' is the second definition.
(I've seen this in another clue)

Can you help me to learn more?

(Other definitions for sting that I've seen before include "Bee/wasp wound" , "Hurt; smart" , "Smart - cheat" , "Con: leader singer of Police" , "Entrapment operation; sharp pain" .)

I've seen this clue in The Sun.

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