Right snake to speak hoarsely (4)
I believe the answer is:
rasp
'speak hoarsely' is the definition.
(I've seen this in another clue)
'right snake' is the wordplay.
'right' becomes 'r' (common abbreviation).
'snake' becomes 'asp' (asp is a kind of snake).
'r'+'asp'='RASP'
'to' is the link.
(Other definitions for rasp that I've seen before include "It is used to grate" , "fruit" , "Abrade" , "unpleasant noise" , "sort of berry?" .)