The most common and most likely answer to this crossword clue is the 4 letter word TABU
I've seen this crossword clue in The Sunday Telegraph
T
A
B
U
More clues leading to the result TABU
- Banned badge originally enclosed in letter from abroad
- Check acceptable but proscribed
- Ban in street a busker
- Put up club, socially acceptable? On the contrary
- A bishop gets in the way of union — it’s forbidden
- Forbidden, but a new constitution is required
- Banned catalogue not long delayed
- An objection? When time’s up it’s forbidden
- Neighbour prioritising time for forbidden activity
- Forbidden key for all to see
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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 TABU mean?
TABU noun- An inhibition or ban that results from social custom or emotional aversion.
- (in Polynesia) Something which may not be used, approached or mentioned because it is sacred.
- To mark as taboo.
- To ban.
- To avoid.