A French spouse, formerly quoted as not enthusiastic (9)
I believe the answer is:
unexcited
'a french spouse formerly quoted' is the definition.
I can't judge whether this definition defines the answer.
'not enthusiastic' is the wordplay.
'not' becomes 'un' (prefix meaning 'not').
'enthusiastic' becomes 'excited' (similar in meaning).
'un'+'excited'='UNEXCITED'
'as' acts as a link.
Can you help me to learn more?
(Other definitions for unexcited that I've seen before include "Impassive" , "In need of stimulation" , "Showing little emotion" , "Not emotionally roused" .)