Stove not initially in fashion (5)
I believe the answer is:
Here is my best explanation:
'stove' is the definition.
('range' can be a synonym of 'stove')
'not initially in fashion' is the wordplay.
'initially' says to take the initial letters.
'in' is an insertion indicator.
'fashion' becomes 'rage' (rage is a kind of fashion**).
The first letter of 'not' is 'n'.
'n' going inside 'rage' is 'RANGE'.
(Other definitions for range that I've seen before include "Stove; scope", "Area of variation", "Array", "sight", "Cooking stove or place for target practice", "Selection", "Aga or mountain, perhaps?", "Cooker", "Variety; wander" and "Series, of mountains perhaps".)