Story of power and fate (4)
I believe the answer is:
plot
'story' is the definition.
(I know that plot is a type of story)
'power and fate' is the wordplay.
'power' becomes 'p' (symbol in physics).
'and' says to put letters next to each other.
'fate' becomes 'lot' (synonyms).
'p'+'lot'='PLOT'
'of' acts as a link.
(Other definitions for plot that I've seen before include "Scheme or small piece of land" , "Conspiracy, secret plan" , "Novel story - secret plan" , "See 12 Across" , "Conspire - small piece of land" .)