The most common and most likely answer to this crossword clue is the 11 letter word IMPERSONATE
I've seen this crossword clue in The Daily Telegraph
I
M
P
E
R
S
O
N
A
T
E
More clues leading to the result IMPERSONATE
- Do change same protein
- Possibly represent one individual detained in China
- I am somebody with a note to copy
- First of engineers in post — airmen free to take off
- Mimic having no spare time for preparation
- Wasting spare time on ape
- Tempo’s in a mess penning Queen parody
- Act pains me to pieces covering Queen
- Primate’s one crazy ape!
- Ape or primate? One’s uncertain
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 IMPERSONATE mean?
IMPERSONATE verb- To pretend to be (a different person); to assume the identity of.
- To operate with the permissions of a different user account.
- To manifest in corporeal form; to personify.