A French former spouse quoted as lacking enthusiasm (9)
I believe the answer is:
unexcited
'a french former spouse quoted as lacking enthusiasm' is the definition.
I can't tell whether this defines the answer.
'a french former spouse quoted' is the wordplay.
'a french' becomes 'un' ('a' in French).
'former spouse' becomes 'ex' (an ex-spouse).
'quoted' becomes 'cited' ('cite' can be a synonym of 'quote').
'un'+'ex'+'cited'='UNEXCITED'
Can you help me to learn more?
(Other definitions for unexcited that I've seen before include "In need of stimulation" , "Impassive" , "Showing little emotion" , "Not emotionally roused" .)