Suppress line in novel (8)
I believe the answer is:
strangle
'suppress' is the definition.
(I know that strangle is a type of suppress)
'line in novel' is the wordplay.
'line' becomes 'l' (used when specifying particular lines from a poem).
'in' means one lot of letters goes inside another.
'novel' becomes 'strange'.
'l' placed into 'strange' is 'STRANGLE'.
(Other definitions for strangle that I've seen before include "cut off supply of air" , "Asphyxiate, throttle" , "Kill by throttling" , "Smother" , "Kill by squeezing the throat" .)