Forefront (8)
I believe the answer is:
vanguard
'forefront' is the definition.
(I know that forefront can be written as vanguard)
This is the entire clue.
(Other definitions for vanguard that I've seen before include "Group at front" , "Leading part of an army" , "Leading troops of military force" , "Leading units moving at the head of an army" , "leaders" .)