Oglers, I fancy, surrounding a harem (8)
I believe the answer is:
seraglio
'harem' is the definition.
(synonyms)
'oglers i fancy surrounding a' is the wordplay.
'fancy' is an anagram indicator.
'surrounding' means one lot of letters goes inside another.
'oglers'+'i'='oglersi'
'oglersi' anagrammed gives 'serglio'.
'serglio' enclosing 'a' is 'SERAGLIO'.
(Other definitions for seraglio that I've seen before include "Harem - eg sailor (anag)" , "Collection of wives" , "Gaolers I mixed up in harem" , "Harem - or silage (anag)" , "female accommodation" .)