Favourable result or the next one (9)
I believe the answer is:
successor
'next one' is the definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.
'favourable result or' is the wordplay.
'favourable result' becomes 'success' (I've seen this before).
'success'+'or'='SUCCESSOR'
'the' is the link.
Can you help me to learn more?
(Other definitions for successor that I've seen before include "One who follows another" , "Heir" , "One following another" , "one will take your place" , "I follow" .)