Name of a little white duck (3)
I believe the answer is:
ted
'name' is the definition.
'a little white duck' is the wordplay.
'a little' indicates a hidden word.
'TED' can be found hidden inside 'white duck'.
'of' is the link.
(Other definitions for ted that I've seen before include "Familiar form of Edward" , "Man's name; make hay" , "Turnover and spread (hay)" , "The familiar American Senator Kennedy" , "Spread hay; man's name" .)