Offenders may be found in these clubs (5)

I believe the answer is:

irons

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'these clubs' is the definition.
(iron is a kind of club)

I can't explain the rest of the clue.

(Other definitions for irons that I've seen before include "Golfclubs with metal hands" , "things for an evening out" , "English actor" , "Metal leg shackles" , "British actor" .)

I've seen this clue in The Globe and Mail.

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