Special ambassador to probe responsibility for curse (9)
I believe the answer is:
blaspheme
'curse' is the definition.
(I know that blaspheme can be written as blaspheme)
'special ambassador to probe responsibility' is the wordplay.
'special' becomes 'sp' (abbreviation).
'ambassador' becomes 'he' (His or Her Excellency).
'to probe' indicates putting letters inside (probe can mean to poke into).
'responsibility' becomes 'blame' (I've seen this in another clue).
'sp'+'he'='sphe'
'sphe' going within 'blame' is 'BLASPHEME'.
'for' acts as a link.
(Other definitions for blaspheme that I've seen before include "Talk irreverently about God and sacred things" , "Curse profanely" , "Speak profanely" , "Say irreverent things about God" , "Utter obscenities or profanities" .)