... however full of beans, ultimately, it's a police raid (4)
I believe the answer is:
bust
'a police raid' is the definition.
(eg a drugs bust)
'however full of beans ultimately' is the wordplay.
'however' becomes 'but' (I've seen this in another clue).
'full of' means one lot of letters goes inside another.
'ultimately' suggests the final letters.
The final letter of 'beans' is 's'.
'but' enclosing 's' is 'BUST'.
'it's' is the link.
(Other definitions for bust that I've seen before include "Head-and-shoulders sculpture" , "Portrait - broken" , "Bosom - broken" , "Police raid; broken" , "Sculptor's piece" .)