Head coach missed opening pushover (2-7)
I believe the answer is:
no-brainer
'pushover' is the definition.
I don't know anything about this answer so I cannot judge whether this works.
'head coach missed opening' is the wordplay.
'head' becomes 'nob' (I've seen this in another clue).
'coach' becomes 'trainer' (as in a sports coach).
'missed opening' means to remove the first letter (I've seen 'missing opening' mean this).
'trainer' with its initial letter taken away is 'rainer'.
'nob'+'rainer'='NO-BRAINER'
Can you help me to learn more?
(Other definitions for no-brainer that I've seen before include "Something needing little mental effort" , "An easy decision" , "Something requiring little or no mental effort" , "Something requiring little thought" , "Obvious choice" .)