The most common and most likely answer to this crossword clue is the 6 letter word SPORTY
S
P
O
R
T
Y
More clues leading to the result SPORTY
- Athletic son — rather fat, needing to lose pounds
- Son left university at last keen on games
- Spice Girl‘s bit of leopard print clothing radical? Originally, yes
- Like athletes left in middle of Betws-y-Coed?
- This 13‘s opening in middle of this year
- Athletic drink that’s fortified in case of scurvy
- Too spry? doubtful, losing nothing for being active
Buddy explains!

The straight part
We know that "13" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case 13 = sporty.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 SPORTY mean?
SPORTY adjective- Favourable to sports
- Flashy in appearance.