After hugging guys, one has regret (8)
I believe the answer is:
lamenter
'one has regret' is the definition.
'after hugging guys' is the wordplay.
'after' becomes 'later' (I've seen this before).
'hugging' indicates putting letters inside.
'guys' becomes 'men'.
'later' enclosing 'men' is 'LAMENTER'.
(Other definitions for lamenter that I've seen before include "One expressing grief" , "One greeting" , "One expressing sorrow" .)