Passionate about the rise of Flanders in painting (6)
I believe the answer is:
ardent
'passionate' is the definition.
(similar in meaning)
'the rise of flanders in painting' is the wordplay.
'the rise of flanders' becomes 'den' (I can't justify this - if you can you should give a lot more credence to this answer).
'in' means one lot of letters goes inside another.
'painting' becomes 'art' (painting is an art).
'den' inserted into 'art' is 'ARDENT'.
'about' is the link.
Can you help me to learn more?
(Other definitions for ardent that I've seen before include "Ranted, being impassioned" , "Intensely devoted" , "Passionate, full of feeling" , "Ranted, being passionate" , "Loving and fiery" .)