Fancy man or woman (8)
'woman?' is the definition.
'fancy man or' is the wordplay.
'fancy' indicates an anagram.
'man'+'or'='manor'
'manor' with letters rearranged gives 'NORMA'.
(Other definitions for norma that I've seen before include "Girl" , "The 'Rule' constellation" , "Opera - ex-PM's wife" , "John Major's wife - Bellini opera" , "Marilyn was properly one" .)
(Other definitions for paramour that I've seen before include "Lover, usually illicit" , "A lover, illicit perhaps" , "Mistress, lover" , "fancy woman" , "A married person's secret lover" .)