Duck taking drink on lake (4)
I believe the answer is:
Here is my best explanation:
'duck' is the definition.
(teal is a kind of duck)
'drink on lake' is the subsidiary indication.
'drink' becomes 'tea' (tea is a kind of drink**).
'on' means one lot of letters go next to another.
'lake' becomes 'l'.
'taking' is the link.
(Other definitions for teal that I've seen before include "A duck", "Type of duck", "Greenish-blue colour", "Tale of a duck", "Freshwater duck", "Variety of duck", "Small river duck", "Raise (subject matter)", "Duck - dark greenish-blue" and "Small, short-necked duck".)