Raise right, perhaps favourable aspect (6)

I believe the answer is:

upside

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'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" .)

I've seen this clue in The Telegraph.

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