Give up in police department (4)
I believe the answer is:
cede
'give up' is the definition.
(I know that give up can be written as cede)
'in police department' is the wordplay.
'in' indicates a hidden word.
'CEDE' is hidden within 'police department'.
(Other definitions for cede that I've seen before include "Yield, give way" , "Give up one's rights" , "Yield formally" , "Give up (eg, power)" , "Transfer" .)