The most common and most likely answer to this crossword clue is the 7 letter word BLOOPER
I've seen this crossword clue in The Guardian
B
L
O
O
P
E
R
More clues leading to the result BLOOPER
Buddy explains!

The straight part
We know that "boob" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case boob = blooper.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 BLOOPER mean?
BLOOPER noun- A blunder, an error.
- A fly ball that is weakly hit just over the infielders.
- A filmed or videotaped outtake that has recorded an amusing accident and/or mistake.
- A gaff-rigged fore-and-aft sail set from and aft of the aftmost mast of a square-rigged ship; a spanker.
- A radio which interferes with other radios, causing them to bloop (squeal loudly).