One printed incorrectly in bold (8)
I believe the answer is:
intrepid
'bold' is the definition.
(similar in meaning)
'one printed incorrectly in' is the wordplay.
'one' becomes 'i' (Roman numeral).
'incorrectly' is an anagram indicator (I've seen this in other clues).
'in' means one lot of letters goes inside another.
'printed' with letters rearranged gives 'intrepd'.
'i' going into 'intrepd' is 'INTREPID'.
(Other definitions for intrepid that I've seen before include "Unfearing" , "Fearless, adventurous" , "Novel" , "Brave and fearless" , "without fear" .)