Drop choice to lead London's police force (7)
I believe the answer is:
plummet
'drop' is the definition.
(I know that plummet is a more specific form of the action drop)
'choice to lead london's police force' is the wordplay.
I cannot quite see how this works, but
'choice' could be 'plum' (both can mean excellent) and 'plum' is present in the answer.
'police' could be 'met' (London Metropolitan Police) and 'met' is located in the answer.
This accounts for all the letters.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for plummet that I've seen before include "fall sharply" , "Drop sharply" , "Fall like a stone" , "Fall rapidly" , "Nose-dive" .)