Passing fancy female, attorney spun around (3)
I believe the answer is:
fad
'passing fancy' is the definition.
(a brief trend)
'female attorney spun around' is the wordplay.
'female' becomes 'f' (common abbreviation).
'attorney' becomes 'DA' (district attorney).
'spun around' shows that the letters should be reversed in order (I've seen 'spinning around' mean this).
'da' written backwards gives 'ad'.
'f'+'ad'='FAD'
(Other definitions for fad that I've seen before include "Craze; idiosyncrasy" , "Temporary vogue or craze" , "A craze or current vogue" , "Particular like or dislike, or a craze" , "transient success" .)