The most common and most likely answer to this crossword clue is the 8 letter word SMACKING
I've seen this crossword clue in The Daily Telegraph
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More clues leading to the result SMACKING
Buddy explains!

The straight part
We know that "an abusive punishment" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case an abusive punishment = smacking.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
Crossword Answer definitions
SMACKING verb- To get the flavor of.
- To indicate or suggest something; used with of.
- To have a particular taste; used with of.
- To slap someone.
- To make a smacking sound.
- To strike a child (usually on the buttocks) as a form of discipline. (US spank)
- To wetly separate the lips, making a noise, after tasting something or in expectation of a treat.
- To kiss with a close compression of the lips, so as to make a sound when they separate.
- A series of smacks; the act by which somebody is smacked.