Foreign title given in foolish error (4)
I believe the answer is:
herr
'foreign title' is the definition.
(German equivalent to Mr)
'in foolish error' is the wordplay.
'in' indicates a hidden word.
'HERR' is hidden within 'foolish error'.
'given' acts as a link.
(Other definitions for herr that I've seen before include "European guy" , "A German gentleman" , "German man's title" , "Dieter respectfully addressed" , "Form of address for German male" .)