Coax ambassador with energy into lewd arrangement (7)
I believe the answer is:
wheedle
'coax' is the definition.
(I know that coax can be written as wheedle)
'ambassador with energy into lewd arrangement' is the wordplay.
'ambassador' becomes 'HE' (His or Her Excellency).
'with' indicates putting letters inside.
'energy' becomes 'e' (physics symbol as in E=mc2).
'into' is an insertion indicator.
'arrangement' indicates an anagram.
'he' going around 'e' is 'hee'.
'lewd' anagrammed gives 'wdle'.
'hee' placed into 'wdle' is 'WHEEDLE'.
(Other definitions for wheedle that I've seen before include "Deploy sweet talk" , "Get by coaxing, flattery" , "Use flattery to attain one's end" , "Wheeled around to coax" , "Cajole or attempt to persuade by flattery" .)