Blind to half a limb lying in the salient (9)
I believe the answer is:
oblivious
'blind to' is the definition.
(synonyms)
'half a limb lying in the salient' is the wordplay.
'half' suggests halving the letters.
'lying in' indicates putting letters inside.
'the salient' becomes 'obvious' (I can't justify this - if you can you should give a lot more credence to this answer).
'limb' halved is 'li'.
'li' placed into 'obvious' is 'OBLIVIOUS'.
Can you help me to learn more?
(Other definitions for oblivious that I've seen before include "Absent-mindedly unaware" , "Ignorant" , "Totally unaware" , "Not noticing" , "Unconscious" .)