Blows a gale, reveals a tale! (4)
I believe the answer is:
saga
'a tale' is the definition.
(I know that saga is a type of adventure story)
'blows a gale reveals' is the wordplay.
'reveals' indicates a hidden word.
'SAGA' is hidden in the letters of 'blows a gale'.
(Other definitions for saga that I've seen before include "Old story" , "Tale of heroes" , "A long story or poem - it's a gas" , "Long heroic tale" , "Body of legend" .)