Obvious choice playing Baron in US Casualty (2-7)
I believe the answer is:
no-brainer
'obvious choice' is the definition.
(I've seen this before)
'playing baron in us casualty' is the wordplay.
'playing' indicates anagramming the letters.
'us casualty' becomes 'er' (I am not sure about this - if you are sure you should believe this answer much more).
'baron' with letters rearranged gives 'nobra'.
'nobra'+'in'+'er'='NO-BRAINER'
Can you help me to learn more?
(Other definitions for no-brainer that I've seen before include "Obvious choice" , "Something needing little mental effort" , "That which must be done, obviously" , "Something requiring no mental thought" , "Something requiring little thought" .)