Raise right, perhaps favourable aspect (6)
I believe the answer is:
upside
'favourable aspect' is the definition.
(I've seen this before)
'raise right' is the wordplay.
'raise' becomes 'up' (I've seen this in other clues).
'right' becomes 'side' (I can't explain this - if you can you should believe this answer much more).
'up'+'side'='UPSIDE'
'perhaps' is the link.
Can you help me to learn more?
(Other definitions for upside that I've seen before include "advantage" , "Top surface of something" , "Positive aspect of a situation" , "Favourable aspect" .)