Revises conclusions to protect yours truly (6)
I believe the answer is:
emends
'revises' is the definition.
(I've seen this in another clue)
'conclusions to protect yours truly' is the wordplay.
'conclusions' becomes 'ends' (end is a kind of conclusion).
'to protect' means one lot of letters goes inside another (inserted letters are held or protected).
'yours truly' becomes 'me' (the person who set this crossword).
'ends' going around 'me' is 'EMENDS'.
(Other definitions for emends that I've seen before include "Corrects and improves the text" , "Edits text" , "Revises" , "Changes" , "Makes improvements or corrections" .)