The most common and most likely answer to this crossword clue is the 7 letter word UNSTICK
I've seen this crossword clue in The Guardian
U
N
S
T
I
C
K
More clues leading to the result UNSTICK
Buddy explains!

The straight part
We know that "Free" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case free = unstick.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 UNSTICK mean?
UNSTICK verb- (sometimes figurative) To free from the condition of being stuck.