Drop fruit on police (7)
I believe the answer is:
plummet
'drop' is the definition.
(I know that plummet is a more specific form of the action drop)
'fruit on police' is the wordplay.
'fruit' becomes 'plum' (plum is a kind of fruit).
'on' means one lot of letters go next to another.
'police' becomes 'met' (London Metropolitan Police).
'plum'+'met'='PLUMMET'
(Other definitions for plummet that I've seen before include "Descend" , "Fall like a stone" , "Drop straight down" , "Fall rapidly" , "Fall headlong" .)