Cryptic crossword clue
The sexes in science recur, after setting boundaries 14

The most common and most likely answer to this crossword clue is the 14 letter word CIRCUMFERENCES

I've seen this crossword clue in The Guardian
C
I
R
C
U
M
F
E
R
E
N
C
E
S

Buddy explains!

The straight part
We know that "boundaries" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case boundaries = circumferences.
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 CIRCUMFERENCES mean?

CIRCUMFERENCES noun
  1. The line that bounds a circle or other two-dimensional figure
  2. The length of such a line
  3. The surface of a round or spherical object
  4. The length of the longest cycle of a graph

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