Extraordinary feat, yet it's inevitable (4)
I believe the answer is:
fate
'it's inevitable' is the definition.
(I've seen this in another clue)
'extraordinary feat' is the wordplay.
'extraordinary' indicates anagramming the letters.
'feat' anagrammed gives 'FATE'.
'yet' acts as a link.
(Other definitions for fate that I've seen before include "Lady luck" , "Clotho, Lachesis or Atropos" , "Fortune" , "E.g. Clotho, Atropos" , "Inevitable destiny" .)