Route maps confused pest controller (9)
I believe the answer is:
mousetrap
'pest controller' is the definition.
(mice are pests)
'route maps confused' is the wordplay.
'confused' is an anagram indicator.
'route'+'maps'='routemaps'
'routemaps' is an anagram of 'MOUSETRAP'.
(Other definitions for mousetrap that I've seen before include "Boring hard cheese (informal)" , "Poor cheese (colloq.)" , "A rodent control; (The) long-running play" , "Snare for vermin" , "pest control device" .)