Pious, devout (5)
I believe the answer is:
godly
This clue is a double definition.
'pious' is the first definition.
(similar in meaning)
'devout' is the second definition.
(both can mean religious)
(Other definitions for godly that I've seen before include "Divine" , "Reverential" , "Devout" , "Pious, decent" , "Religious, pious" .)