Speak fondly about London police? Wake up! (4,2)
I believe the answer is:
come to
'wake up' is the definition.
(eg coming to after fainting)
'speak fondly about london police?' is the wordplay.
'speak fondly' becomes 'coo' (to coo is to speak gently or fondly).
'about' indicates putting letters inside.
'london police?' becomes 'Met' (London Metropolitan Police).
'coo' enclosing 'met' is 'COME TO'.
(Other definitions for come to that I've seen before include "Resuscitate" , "Start fighting" , "Regain consciousness or arrive at" , "Wake up" , "Regain consciousness - stop vessel" .)