The most common and most likely answer to this crossword clue is the 1 plus 5 plus 2 plus 4 plus 3 plus 8 letter word A TASTE OF ONES OWN MEDICINE
I've seen this crossword clue in The Times
A
T
A
S
T
E
O
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O
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E
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N
M
E
D
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More clues leading to the result A TASTE OF ONES OWN MEDICINE
Buddy explains!
The straight part
We know that "similar treatment" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case similar treatment = a taste of ones own medicine.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.