Source of danger lacking power in sacred text (6)
I believe the answer is:
mantra
'sacred text' is the definition.
(mantra is a kind of sacred text)
'source of danger lacking power' is the wordplay.
'source of' becomes 'man' (I can't explain this - if you can you should believe this answer much more).
'danger' becomes 'trap' (I have seen 'Hidden danger' mean 'trap' so perhaps 'danger' could also mean 'trap').
'lacking' indicates named letters should be taken away.
'power' becomes 'p'.
'trap' with 'p' taken away is 'tra'.
'man'+'tra'='MANTRA'
'in' is the link.
Can you help me to learn more?
(Other definitions for mantra that I've seen before include "Phrase repeated as aid to meditation in Buddhism" , "Word repeated as aid to concentration during meditation" , "Slogan; refrain" , "Sound repeated as an aid to meditation" , "Special word repeated in Buddhist meditation" .)