Just blonde getting resented (4-6)
I believe the answer is:
fair-minded
'just' is the definition.
(I've seen this before)
'blonde getting resented' is the wordplay.
'blonde' becomes 'fair' (similar in meaning).
'getting' says to put letters next to each other.
'resented' becomes 'minded' (I can't explain this - if you can you should give a lot more credence to this answer).
'fair'+'minded'='FAIR-MINDED'
Can you help me to learn more?
(Another definition for fair-minded that I've seen is " Judging justly".)