Mr Todd of the Flying Squad (7)
I believe the answer is:
sweeney
'the flying squad' is the definition.
(I've seen this before)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for sweeney that I've seen before include "London police" , "The flying squad" , "------- Todd, the 'demon barber of Fleet Street'" .)