Cryptic crossword clue
Goes too far making up for misdeed done with fellow politician, beginning to expose top of slit in buttocks 15

The most common and most likely answer to this crossword clue is the 15 letter word OVERCOMPENSATES

I've seen this crossword clue in Financial Times
O
V
E
R
C
O
M
P
E
N
S
A
T
E
S

Buddy explains!

The straight part
We know that "Goes too far making up" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case goes too far making up = overcompensates.
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.

What does OVERCOMPENSATES mean?

OVERCOMPENSATES verb
  1. To do an excessive amount in one area in an effort to overcome a perceived lack in another area.
  2. To provide with excessive pay or reward for work performed.

Latest crossword clues with full explanations