Bring down books to entertain setter and solver? (4)
I believe the answer is:
oust
'bring down' is the definition.
(as in ousting a political leader)
'books to entertain setter and solver?' is the wordplay.
'books' becomes 'OT' (abbreviation for Old Testament).
'to entertain' indicates putting letters inside.
'setter and solver?' becomes 'us' (the setter and the solver of the crossword).
'ot' placed around 'us' is 'OUST'.
(Other definitions for oust that I've seen before include "Give marching orders" , "Get rid of" , "Drive out, eject from office" , "Remove from a position of power" , "Overthrow" .)