They show the way (6)
I believe the answer is:
guides
'they show the way' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for guides that I've seen before include "Directs or steers" , "Persons leading mountaineers etc" , "Shows the way" , "They show others the way - may be girls" , "Leads or conducts" .)