Answers about sour concoction left excitement (7)
I believe the answer is:
arousal
'excitement' is the definition.
(I've seen this before)
'answers about sour concoction left' is the wordplay.
'answers' becomes 'aa' (an abbreviation for answer written twice).
'about' is an insertion indicator.
'concoction' indicates an anagram.
'left' becomes 'l' (common abbreviation).
'sour' is an anagram of 'rous'.
'aa' enclosing 'rous' is 'arousa'.
'arousa'+'l'='AROUSAL'
(Other definitions for arousal that I've seen before include "Awakening; stimulation" , "Drinking spree" , "Act of waking (someone)" , "Awakening (of emotion, etc)" , "Sexual excitement" .)