Clue: After first shouting you are sounding serious – that's bizarre! (7)
Answer: SURREAL
Explanation: After first shouting you are sounding serious – that's bizarre! (7) 
S-UR ("you are" sounding)-REAL
 
In my opinion, the "you are" is clumsy, as the clue doesn't include the homophone. If I'm being generous, it may be OK, becaause it is indicating the two individual letters U and R, but the "you are" sound doesn't form part of the answer.