The most common and most likely answer to this crossword clue is the 11 letter word MOCKINGBIRD
I've seen this crossword clue in The Daily Telegraph
M
O
C
K
I
N
G
B
I
R
D
More clues leading to the result MOCKINGBIRD
Buddy explains!
The straight part
We know that "singer copying others" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case singer copying others = mockingbird.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 MOCKINGBIRD mean?
MOCKINGBIRD noun- A long-tailed American songbird of the Mimidae family, noted for its ability to mimic calls of other birds.