Cryptic crossword clue
Polish official in charge at the end 6

The most common and most likely answer to this crossword clue is the 6 letter word REFINE

I've seen this crossword clue in The Guardian
R
E
F
I
N
E

Buddy explains!

The straight part
We know that "Polish" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case polish = refine.
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 REFINE mean?

REFINE verb
  1. To purify; reduce to a fine, unmixed, or pure state; to free from impurities.
  2. To become pure; to be cleared of impure matter.
  3. To purify of coarseness, vulgarity, inelegance, etc.; to polish.
  4. To improve in accuracy, delicacy, or excellence.
  5. To make nice or subtle.

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