Page penned by retiring Tories — protection for that? (9)
I believe the answer is:
copyright
'protection for that?' is the definition.
(copyright is a legal protection)
'page penned by retiring tories' is the wordplay.
'page' becomes 'p'.
'penned by' is an insertion indicator.
'retiring' becomes 'coy' (I've seen this in other clues).
'tories' becomes 'right'.
'p' going inside 'coy' is 'copy'.
'copy'+'right'='COPYRIGHT'
(Other definitions for copyright that I've seen before include "Protection for writer" , "Sole entitlement to produce literary works" , "it gives one freedom to reproduce" , "control publication" , "property of the author?" .)