Lawful, legal (5)
I believe the answer is:
licit
I believe this clue is a double definition.
'lawful' is the first definition.
(I know that lawful can be written as licit)
'legal' is the second definition.
(similar in meaning)
(Other definitions for licit that I've seen before include "Legitimate" , "OK?" , "Honest" , "Permitted by law" , "in order" .)