Old swinger nude lump possibly? (8)
I believe the answer is:
pendulum
'old swinger' is the definition.
'pendulum' can be an answer for 'swinger' (something which swings). I am not sure about the 'old' bit.
'nude lump possibly?' is the wordplay.
'possibly?' indicates an anagram (I've seen 'possibly' mean this).
'nude'+'lump'='nudelump'
'nudelump' is an anagram of 'PENDULUM'.
Can you help me to learn more?
(Other definitions for pendulum that I've seen before include "Vacillator" , "Moves to and fro" , "It swings to and fro as in old clock" , "Swinging device used to regulate clock" , "A swinging weight as in old clock" .)