Crossword Genius

Ministry associable with cons? (3)

Ross

I believe the answer is:

mod

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'ministry' is the definition.
(Ministry of Defence)

I cannot understand how the remainder of the clue works.

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(Other definitions for mod that I've seen before include "1960s teenager" , "ministry" , "Gaelic literary festival" , "Rocker's rival?" , "Meeting of the Scottish" .)

I've seen this clue in the Evening Standard.
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