Something fruity about naughty nude swinger (8)
I believe the answer is:
pendulum
'swinger' is the definition.
(something which swings)
'something fruity about naughty nude' is the wordplay.
'something fruity' becomes 'plum' (a plum is a fruit).
'about' is an insertion indicator.
'naughty' indicates an anagram.
'nude' anagrammed gives 'endu'.
'plum' going around 'endu' is 'PENDULUM'.
(Other definitions for pendulum that I've seen before include "A swinging weight as in old clock" , "Oscillating mechanism" , "Swinging part of clock" , "Old time swinger?" , "Weight hung from a fixed point to regulate a clock" .)