The most common and most likely answer to this crossword clue is the 11 letter word WEATHERCOCK
W
E
A
T
H
E
R
C
O
C
K
More clues leading to the result WEATHERCOCK
Buddy explains!

The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does WEATHERCOCK mean?
WEATHERCOCK noun- A weather vane, sometimes in the form of a cockerel.
- One who veers with every change of current opinion; a fickle, inconstant person.
- (Chiefly US and Canada) A wind pump style where the top of it behaves like a weather vane, moving with the wind direction, but also with a wheel attached to measure wind speed.
- (of a boat) To turn upwind because of the difference in water pressure on two sides.
- (of an airplane or missile) To veer into the direction of the oncoming (relative) wind.
- To act as a weathercock for.