Ambassador getting record assistance (4)
I believe the answer is:
help
'assistance' is the definition.
(I know that assistance can be written as help)
'ambassador getting record' is the wordplay.
'ambassador' becomes 'he' (His or Her Excellency).
'getting' means one lot of letters go next to another.
'record' becomes 'lp' (abbreviation for long play record).
'he'+'lp'='HELP'
(Other definitions for help that I've seen before include "Guide" , "Contribute to the success of" , "Charity" , "Be of service" , "Hit from Band" .)