The most common and most likely answer to this crossword clue is the 8 letter word PENDULUM
I've seen this crossword clue in The Times
P
E
N
D
U
L
U
M
More clues leading to the result PENDULUM
- Swinger cavorting nude bedded by half 11
- Old-time swinger?
- Swinger‘s nude antics, getting covered in fruit
- In grandfather’s case, a regular swinger
- It’s sleep-inducing to write note on 40% of curriculum
- Swinger with ghastly nude in Victoria?
- Something fruity about naughty nude swinger
- Desirable to engage naughty nude for swinger
- Writer’s less than boring and — how can I put this? — a swinger
- Plum nude rudely reveals one hanging and swinging freely
Buddy explains!

The straight part
We know that "Old-time swinger?" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case old-time swinger? = pendulum.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 PENDULUM mean?
PENDULUM noun- A body suspended from a fixed support so that it swings freely back and forth under the influence of gravity, commonly used to regulate various devices such as clocks.
- A lamp, etc. suspended from a ceiling.
- A watch's guard-ring by which it is attached to a chain.