Finish speech on Klan leader and sound like a goose (4)
I believe the answer is:
honk
'sound like a goose' is the definition.
(I've seen this in another clue)
'finish speech on klan leader' is the wordplay.
'finish' says to take the final letters.
'leader' suggests taking the first letters.
The last letter of 'speech' is 'h'.
The initial letter of 'klan' is 'k'.
'h'+'on'+'k'='HONK'
'and' is the link.
(Other definitions for honk that I've seen before include "Toot of a horn - cry of a goose - smell nasty" , "Cry of a goose - sound of a horn" , "Cry of the wild goose" , "Toot one's horn" .)