The most common and most likely answer to this crossword clue is the 10 letter word UNSHIELDED
I've seen this crossword clue in Financial Times
U
N
S
H
I
E
L
D
E
D
Buddy explains!
The straight part
We know that "having lost one’s bearings?" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case having lost one’s bearings? = unshielded.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 UNSHIELDED mean?
UNSHIELDED adjective- Not shielded.