Time to show a way ahead (3)
I believe the answer is:
eon
'time' is the definition.
(eon is a kind of time)
'a way ahead' is the wordplay.
'a way' becomes 'e' (Compass direction - East).
'ahead' becomes 'on' (synonyms).
'e'+'on'='EON'
'to show' acts as a link.
(Other definitions for eon that I've seen before include "Vast age; eternity" , "billion years" , "plenty of time" , "Vast age (alt. sp.)" , "Immense period" .)