Crossword Genius

One blow after another makes great entertainment (5,3)

Ross

I believe the answer is:

smash hit

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'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" .)

I've seen this clue in The Globe and Mail.
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