Prosper - like Dusty Miller? (8)
I believe the answer is:
flourish
'prosper like dusty miller?' is the definition.
'flourish' can be an answer for 'prosper' (synonyms). I'm not certain of the 'like dusty miller?' bit.
'prosper like' is the wordplay.
'prosper' becomes 'flour' (I can't justify this - if you can you should give a lot more credence to this answer).
'like' becomes 'ish' (similar in meaning).
'flour'+'ish'='FLOURISH'
Can you help me to learn more?
(Other definitions for flourish that I've seen before include "Grow vigorously and healthily" , "Bloom" , "success" , "Thrive; ornamental passage of music" , "show off" .)