Scene rewritten keeps one line still (7)
I believe the answer is:
silence
'still' is the definition.
(I know that still can be written as silence)
'scene rewritten keeps one line' is the wordplay.
'rewritten' indicates an anagram.
'keeps' means one lot of letters goes inside another.
'one' becomes 'I' (Roman numeral).
'line' becomes 'l' (used when specifying particular lines from a poem).
'scene' anagrammed gives 'sence'.
'i'+'l'='il'
'sence' enclosing 'il' is 'SILENCE'.
(Other definitions for silence that I've seen before include "Absence of sound" , "No talking" , "Secrecy; stillness" , "License (anag)" , "'The rest is - - '(Hamlet)" .)