Almost all orgies affected wives collectively (8)
I believe the answer is:
seraglio
'wives collectively' is the definition.
'seraglio' can be an answer for 'wives' (I have seen 'Muslim wives' mean 'seraglio' so perhaps 'wives' could also mean 'seraglio'). I am unsure of the 'collectively' bit.
'almost all orgies affected' is the wordplay.
'almost' means to remove the last letter (almost the whole word is kept).
'affected' indicates an anagram.
'all' with its final letter taken away is 'al'.
'al'+'orgies'='alorgies'
'alorgies' anagrammed gives 'SERAGLIO'.
Can you help me to learn more?
(Other definitions for seraglio that I've seen before include "Harem - eg sailor (anag)" , "Where there's lots of the other" , "Harem - or silage (anag)" , "single-sex accommodation" , "Gaolers I found in Turkish women's quarters" .)