Ray perhaps hiding scowl gets to prosper (8)
I believe the answer is:
flourish
'prosper' is the definition.
('flourish' can be a synonym of 'prosper')
'ray perhaps hiding scowl' is the wordplay.
'ray perhaps' becomes 'fish' (ray is a kind of fish).
'hiding' indicates putting letters inside.
'scowl' becomes 'lour' (I've seen this before).
'fish' going around 'lour' is 'FLOURISH'.
'gets to' is the link.
(Other definitions for flourish that I've seen before include "Thrive; ornamental passage of music" , "Fanfare!" , "Large vase, pot" , "Wax" , "Fine food is hard to" .)