In the story, I act as guide (5)
I believe the answer is:
pilot
'guide' is the definition.
(pilot can mean a navigator)
'in the story i' is the wordplay.
'in the' is an insertion indicator.
'story' becomes 'plot' (plot is a kind of story).
'plot' going around 'i' is 'PILOT'.
'act as' is the link.
This may not be right. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for pilot that I've seen before include "Flier of aircraft" , "Captain of plane or boat" , "trial episode" , "Person in charge of aircraft" , "One who brings a vessel into port" .)