The most common and most likely answer to this crossword clue is the 6 letter word WINCED
I've seen this crossword clue in The Guardian
W
I
N
C
E
D
More clues leading to the result WINCED
Buddy explains!
The straight part
We know that "Shrank back" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case shrank back = winced.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 WINCED mean?
WINCED verb- To flinch as if in pain or distress.
- To wash (cloth), dip it in dye, etc., with the use of a wince.
- To kick or flounce when unsteady or impatient.