Corrected, replacing leader with son having vision (7)
I believe the answer is:
sighted
'having vision' is the definition.
(with sight)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for sighted that I've seen before include "Not blind" , "Saw; able to see" , "Noticed" , "Espied" , "Viewers are" .)