Apprehend in Osnaburgh (3)
I believe the answer is:
nab
'apprehend' is the definition.
(synonyms)
'in osnaburgh' is the wordplay.
'in' says the answer is hidden in the clue.
'NAB' is hidden within 'osnaburgh'.
(Other definitions for nab that I've seen before include "Catch; grab suddenly" , "Apprehend" , "Take" , "Pinch" , "Capture, catch" .)