The most common and most likely answer to this crossword clue is the 11 letter word SCAREDY-CAT
I've seen this crossword clue in Financial Times
S
C
A
R
E
D
Y
-
C
A
T
More clues leading to the result SCAREDY-CAT
Buddy explains!
The straight part
We know that "Wimp" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case wimp = scaredy-cat.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 SCAREDY-CAT mean?
SCAREDY-CAT noun- A coward; a person who is easily frightened or high-strung and easily scared.