Page carries on, takes liberties (8)
I believe the answer is:
presumes
'takes liberties' is the definition.
(I've seen this before)
'page carries on' is the wordplay.
'page' becomes 'p'.
'carries on' becomes 'resumes' (I've seen this before).
'p'+'resumes'='PRESUMES'
(Other definitions for presumes that I've seen before include "... supposes" , "Takes to be the case" , "takes liberties" .)