It's just about being blond (8)
I believe the answer is:
fairness
'it's just' is the definition.
(I've seen this before)
'about being blond' is the wordplay.
I cannot quite understand how this works, but
'about' could be 'a' (abbreviation in Chambers) and 'a' is found within the answer.
'being' could be 'rn' (RN is an example) and 'rn' is located in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for fairness that I've seen before include "the fine, dry state of the weather" , "Equity, justice" , "Equality" , "Beauty - justice" , "Impartiality, justice" .)