Just light complexioned (4)
I believe the answer is:
fair
'just' is the definition.
(just can mean fair in the sense of showing justice)
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for fair that I've seen before include "Exhibition of commercial or industrial goods" , "All clues should be" , "The mart is blond" , "Traders' gathering" , "Trade exhibition, (of weather) fine" .)