Catchphrase from heavy-going books, setter falls for solver in the second (2,2,2,3)
I believe the answer is:
to me to you
'catchphrase from heavy-going' is the definition.
I don't know anything about this answer so I cannot judge whether this works.
'books setter falls for solver in the second' is the wordplay.
I cannot really understand how this works, but
'setter' could be 'me' (the setter of the clue) and 'me' is found within the answer.
'books' could be 'ot' (Old Testament) and 'ot' is present in the leftover letters.
'for' could be 'to' (eg both can mean 'in the opinion of') and 'to' is present in the answer.
'solver' could be 'you' (the person solving the crossword) and 'you' is located in the answer.
No letters remain.
This explanation may well be incorrect...
Can you help me to learn more?