What does the cryptic crossword clue "Actor scans novel that's hallowed (10)" mean?

The definition is "hallowed". The wordplay uses an anagram. anagram of ACTOR + SCANS = SACROSANCT; definition: "hallowed" The answer is SACROSANCT.

Actor scans novel that's hallowed (10)

Daily Mail Cryptic #17139 | 13 Across | 2023-07-12 flower