The most common and most likely answer to this crossword clue is the 5 letter word ORANG
I've seen this crossword clue in The Guardian
O
R
A
N
G
More clues leading to the result ORANG
- Primate, old, managed grand university function
- Tree-dweller in shade endlessly
- Our cousin called, briefly out and about
- Primate telephoned by old sick aunt
- Chancellor Angela adopting vulnerable Indonesian resident
- Primate called round to begin with
- Swinger didn’t get called
- Primate called round earlier
- Love getting called a hairy beast
- Primate’s holy book, apart from the introduction, good
Buddy explains!

The straight part
We know that "Swinger" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case swinger = orang.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 ORANG mean?
ORANG noun- An orangutan.