Ducks pine for tea (6)
I believe the answer is:
oolong
'tea' is the definition.
(oolong is a kind of tea)
'ducks pine' is the wordplay.
'ducks' becomes 'oo' (I've seen this in other clues).
'pine' becomes 'long' (synonyms).
'oo'+'long'='OOLONG'
'for' is the link.
(Other definitions for oolong that I've seen before include "Chinese tea leaves - no logo (anag)" , "oriental tea" , "sort of leaves" , "A variety of black China tea with green tea flavour" , "Kind of China tea" .)