Promiscuous ladies and gents beginning to embrace (5)
I believe the answer is:
loose
'promiscuous' is the definition.
(loose can mean promiscuous)
'ladies and gents beginning to embrace' is the wordplay.
'ladies and gents' becomes 'loos' (toilets).
'beginning to' says to take the initial letters.
The initial letter of 'embrace' is 'e'.
'loos'+'e'='LOOSE'
(Other definitions for loose that I've seen before include "Unattached" , "Unrestrained" , "Slack; not exact" , "Slack or immoral" , "Free or immoral" .)