At the time, fears they're wrong (6)
I believe the answer is:
errors
'at the time fears' is the definition.
I can't tell whether this defines the answer.
'wrong' is the wordplay.
I cannot really see how this works, but
'wrong' could be 'err' (to err is make an error) and 'err' is present in the answer.
The remaining letters 'ors' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
'they're' acts as a link.
Can you help me to learn more?
(Other definitions for errors that I've seen before include "boobs" , "Mistakes and omissions" , "Gaffes" , "Subject of Shakespearean 6" , "Mistakes, slip-ups" .)