In order to be honest (8)
I believe the answer is:
straight
I believe this clue is a double definition.
'in order' is the first definition.
(thesaurus)
'honest' is the second definition.
(similar in meaning)
'to be' acts as a link.
(Other definitions for straight that I've seen before include "Serious" , "Good poker hand" , "Without curve or bend" , "Liking the opposite sex" , "Without deviations or curves" .)