The most common and most likely answer to this crossword clue is the 4 letter word BOOB
B
O
O
B
More clues leading to the result BOOB
- Slip covering one?
- Either way, it’s a mistake
- Critically react to bishop making awful move, say
- ‘Bish’: utterance that may startle bishop
- Error on the Tube, perhaps?
- A mistake, whichever way you look at it
- I really dislike that book — it’s an embarrassment
- Mistake to indicate vocal disapproval of book
- Missing open goal, say, in scoreless draw between British sides
- Anna moved on consistently to make an error
Buddy explains!

The straight part
We know that "it’s an embarrassment" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case it’s an embarrassment = boob.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 BOOB mean?
BOOB noun- Idiot, fool.
- To behave stupidly; to act like a boob.
- To make a mistake
- Idiotic, foolish.
- A breast, especially that of an adult or adolescent human female.
- A prison; jail.