The Crossword Centre Clue-Writing Competition

CCCWC August competition voters’ comments
 
Clue no. 25: It's missing in second class post to be exact (9)

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A clue to BLACKMAIL.
2 comments refer to this clue (from 2 competitors, 0 others)

Here is the text

Comments on the clue
1.Missing = lacking not lack
2.LACK = it's missing is awkward (you really need what's missing). Nice though.