One blow after another makes great entertainment (5,3)
I believe the answer is:
smash hit
'great entertainment' is the definition.
(I've seen this before)
'one blow after another makes' is the wordplay.
'one blow' becomes 'smash' (smash is a kind of blow).
'after another makes' becomes 'hit' (I can't justify this - if you can you should give a lot more credence to this answer).
'smash'+'hit'='SMASH-HIT'
Can you help me to learn more?
(Other definitions for smash hit that I've seen before include "most popular show!" , "Great success" , "roaring success" , "successful play?" , "number one" .)