Pop song might break strike! (5,3)
I believe the answer is:
smash hit
'strike' is the definition.
(I know that smash hit is a type of strike)
'pop song might break' is the wordplay.
I cannot really understand how this works, but
'song' could be 'hit' (I have seen 'Successful song' mean 'hit' so perhaps 'song' could also mean 'hit') and 'hit' is found in the answer.
'break' could be 'smash' (smashing is a kind of breaking) and 'smash' is found in the answer.
No letters remain.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for smash hit that I've seen before include "great entertainment" , "Major success" , "big success" , "blockbuster" , "successful play?" .)