Approach police leading stretcher-bearer? (6)
I believe the answer is:
method
'approach' is the definition.
(I've seen this in another clue)
'police leading stretcher-bearer?' is the wordplay.
'police' becomes 'met' (London Metropolitan Police).
'leading' means one lot of letters go next to another (some letters go in front of others).
'stretcher bearer?' becomes 'hod' (hods carry bricks - stretcher is a type of brick).
'met'+'hod'='METHOD'
(Other definitions for method that I've seen before include "Way of doing something, procedure" , "Way of doing something, even in madness (6)" , "Systematic procedure" , "Systematic way of doing something" , "Order" .)