Concession opening shortly is hardly raising awareness (9)
I believe the answer is:
soporific
'hardly raising awareness' is the definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.
'concession opening shortly' is the wordplay.
I cannot quite understand how this works, but
'concession' could be 'sop' (sop is a kind of concession) and 'sop' is found in the answer.
This may be the basis of clue (or it may be nonsense).
'is' acts as a link.
Can you help me to learn more?
(Other definitions for soporific that I've seen before include "Inducing mental lethargy" , "Sedative" , "Sleep-inducing" , "Inducing drowsiness or sleep" , "Causing sleepiness" .)