The most common and most likely answer to this crossword clue is the 13 letter word INEXACTITUDES
I've seen this crossword clue in Financial Times
I
N
E
X
A
C
T
I
T
U
D
E
S
Buddy explains!

The straight part
We know that "boobs" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case boobs = inexactitudes.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.
Crossword Answer definitions
INEXACTITUDES noun- A lack of exactness; something inexact or imprecise