Guide soldiers to hill (6)
I believe the answer is:
mentor
'guide' is the definition.
(I've seen this before)
'soldiers to hill' is the wordplay.
'soldiers' becomes 'men' (men can mean a group of soldiers).
'to hill' becomes 'tor' (tor is a kind of hill).
'men'+'tor'='MENTOR'
(Other definitions for mentor that I've seen before include "Merton (anag.)" , "Wise and experienced counsellor" , "Personal guide" , "Train" , ""Guide, philosopher, and friend"" .)