Depends once more on deception (6)
I believe the answer is:
relies
'depends' is the definition.
(I've seen this before)
'more on deception' is the wordplay.
'more' becomes 'res' (I am not sure about this - if you are sure you should believe this answer much more).
'on' indicates putting letters inside (as in clothing 'on' a person).
'deception' becomes 'lie' (lying to someone is deceiving them).
'res' enclosing 'lie' is 'RELIES'.
'once' is the link.
Can you help me to learn more?
(Other definitions for relies that I've seen before include "Banks (on)" , "Has confidence or faith in" , "'Trusts, depends (6)'" .)