Turn page, interrupting trick (5)
I believe the answer is:
spell
'turn' is the definition.
(I know this)
'page interrupting trick' is the wordplay.
'page' becomes 'p'.
'interrupting' means one lot of letters goes inside another.
'trick' becomes 'sell' (sell could historically mean to deceive ).
'p' inserted into 'sell' is 'SPELL'.
(Other definitions for spell that I've seen before include "Short period of time; incantation" , "Indicate" , "Magic formula - period of time" , "term" , "something to cast" .)