Truss with point about pound showing lack of vision (9)
I believe the answer is:
blindness
'pound showing lack of vision' is the definition.
I can't tell whether this defines the answer.
'truss with point' is the wordplay.
'truss with' becomes 'blind' (I can't justify this - if you can you should give a lot more credence to this answer).
'point' becomes 'ness' (ness can mean a geographical point).
'blind'+'ness'='BLINDNESS'
'about' is the link.
Can you help me to learn more?
(Other definitions for blindness that I've seen before include "Topic of one poem by Milton" , "Milton's final affliction" , "Failing to see" .)