Cryptic crossword clue
Repeatedly Old Bill’s covering up unacceptable things 6

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

I've seen this crossword clue in The Guardian
T
A
B
O
O
S

Buddy explains!

The straight part
We know that "unacceptable things" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case unacceptable things = taboos.
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 TABOOS mean?

TABOOS noun
  1. An inhibition or ban that results from social custom or emotional aversion.
  2. (in Polynesia) Something which may not be used, approached or mentioned because it is sacred.

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