Swinger (promiscuous person) cuddling large female (6)
I believe the answer is:
golfer
'swinger' is the definition.
The definition and answer can be both people as well as being singular nouns.
Maybe you can see an association between them that I can't see?
'promiscuous person cuddling large female' is the wordplay.
'promiscuous person' becomes 'goer' (goer is a kind of person. I am not sure about the 'promiscuous' bit.).
'cuddling' indicates putting letters inside.
'large' becomes 'l'.
'female' becomes 'f' (abbreviation).
'l'+'f'='lf'
'goer' enclosing 'lf' is 'GOLFER'.
Can you help me to learn more?
(Other definitions for golfer that I've seen before include "Player on links" , "Swinger on course" , "Driver, chipper and putter" , "Player with clubs and tees" , "McGinley or Harrington, say" .)