Full permit given to salesman with energy (7)
I believe the answer is:
replete
'full' is the definition.
('replete' can be a synonym of 'full')
'permit given to salesman with energy' is the wordplay.
'permit' becomes 'let' ('let' can be a synonym of 'permit').
'given to' is a charade indicator (letters next to each other).
'salesman' becomes 'rep' (I've seen this before).
'with' is a charade indicator (letters next to each other).
'energy' becomes 'e' (physics symbol as in E=mc2).
'let' put after 'rep' is 'replet'.
'replet'+'e'='REPLETE'
(Other definitions for replete that I've seen before include "Filled to satisfaction" , "Completely filled" , "Well-fed" , "Full of food, gorged" , "Fully satisfied" .)