Bowdlerise (9)
I believe the answer is:
expurgate
'bowdlerise' is the definition.
(synonyms)
This is all the clue.
(Other definitions for expurgate that I've seen before include "Remove unsuitable matter from (a text)" , "Remove unsuitable material from (a text)" , "Remove objectionable matter from book" , "Edit by modifying parts considered indelicate" , "Amend to remove anything deemed offensive - eg pure tax (anag)" .)