I like that! Nothing in Police Department for Woodlouse? (6)
I believe the answer is:
isopod
'for woodlouse?' is the definition.
(woodlouse is a kind of isopod)
'i like that nothing in police department' is the wordplay.
'like that' becomes 'so' (as in 'like so').
'nothing' becomes 'O' (O resembles 0).
'in' indicates putting letters inside.
'police department' becomes 'PD' (as in NYPD, LAPD etc).
'o' placed into 'pd' is 'pod'.
'i'+'so'+'pod'='ISOPOD'
(Other definitions for isopod that I've seen before include "Crawler" , "This crusty creature" , "Woodlouse, say" , "small crustacean" , "Crustacean such as a woodlouse" .)