Agitated ambassador, a male beast (3,2)
I believe the answer is:
het up
'agitated' is the definition.
(I've seen this before)
'ambassador a male beast' is the wordplay.
'ambassador' becomes 'he' (His or Her Excellency).
'a male beast' becomes 'tup' (ram).
'he'+'tup'='HET UP'
(Other definitions for het up that I've seen before include "in a rage?" , "On edge - agitated" , "in a state" , "Irate" , "Upset, agitated" .)