Some balls and parties regularly end having taken in excess (9)
I believe the answer is:
overdosed
'taken in excess' is the definition.
The definition and answer can be both related to bodily activities as well as being past participle verbs.
Maybe you can see a link between them that I can't see?
'some balls and parties regularly end' is the wordplay.
'some balls' becomes 'over' (I've seen this in other clues).
'and' says to put letters next to each other.
'parties' becomes 'dos' (do is a kind of party).
'regularly end' becomes 'ed' (I can't justify this - if you can you should believe this answer much more).
'over'+'dos'+'ed'='OVERDOSED'
'having' acts as a link.
Can you help me to learn more?
(Other definitions for overdosed that I've seen before include "Took extra" , "Took excess drugs" , "took too many pills" , "dangerously zonked?" , "did smack excessively?" .)