It's earned working to curry favour (6)
I believe the answer is:
endear
'curry favour' is the definition.
Although both the answer and definition are verbs in their base form, I can't understand how they can define each other.
'it's earned working' is the wordplay.
'working' indicates anagramming the letters.
'earned' anagrammed gives 'ENDEAR'.
'to' acts as a link.
Can you help me to learn more?
(Other definitions for endear that I've seen before include "Arouse affection" , "Evoke love - charm" , "Charm, captivate" , "make sweet" , "Make popular" .)