Accepted it in some state of vacuousness (7)
I believe the answer is:
inanity
'state of vacuousness' is the definition.
'inanity' can be an answer for 'vacuousness' (thesaurus). I'm unsure of the 'state of' bit.
'accepted it in some' is the wordplay.
'accepted' becomes 'in' (I've seen this in other clues).
'in' means one lot of letters goes inside another.
'some' becomes 'any' (similar in meaning).
'it' going inside 'any' is 'anity'.
'in'+'anity'='INANITY'
Can you help me to learn more?
(Other definitions for inanity that I've seen before include "act of stupidity" , "Silliness in a tiny way" , "Senselessness - frivolous utterance" , "Foolishness" , "Mindlessness" .)