Lewis initially accepts blame for shooting game (5)
I believe the answer is:
craps
'shooting game' is the definition.
(I've seen this in another clue)
'lewis initially accepts blame' is the wordplay.
'lewis initially' becomes 'cs' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'accepts' is an insertion indicator.
'blame' becomes 'rap' (synonyms).
'cs' enclosing 'rap' is 'CRAPS'.
'for' is the link.
Can you help me to learn more?
(Other definitions for craps that I've seen before include "[EXCRETA]" , "2 8 [CASINO GAMES]" , "Gambling game involving dice" .)