The most common and most likely answer to this crossword clue is the 8 letter word FLINCHED
I've seen this crossword clue in The Times
F
L
I
N
C
H
E
D
Buddy explains!

The straight part
We know that "Drew back" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case drew back = flinched.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 FLINCHED mean?
FLINCHED verb- To strip the blubber or skin from, as from a whale, seal, etc.
- To make a sudden, involuntary movement in response to a (usually negative) stimulus; to cringe.
- To dodge (a question), to avoid an unpleasant task or duty
- To let the foot slip from a ball, when attempting to give a tight croquet.