Diplomat dancing samba, pathetic otherwise (10)
I believe the answer is:
ambassador
'diplomat' is the definition.
(ambassador is a kind of diplomat)
'dancing samba pathetic otherwise' is the wordplay.
'dancing' is an anagram indicator.
'pathetic' becomes 'sad'.
'otherwise' becomes 'or'.
'samba' with letters rearranged gives 'ambas'.
'ambas'+'sad'+'or'='AMBASSADOR'
(Other definitions for ambassador that I've seen before include "Messenger" , "voice?" , "Overseas envoy" , "delegate" , "diplomatic type" .)