Guide, watch over (8)
I believe the answer is:
shepherd
I believe this is a double definition.
'guide' is the first definition.
(I've seen this before)
'watch over' is the second definition.
(thesaurus)
(Other definitions for shepherd that I've seen before include "lamb tender" , "dog German lost" , "One tending a flock" , "Say Corydon" , "Pastor" .)