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 subsidiary indication.
'initially' says to take the initial letters.
'in' means one lot of letters goes inside another.
'fashion' becomes 'rage' (rage is a kind of fashion**).
The initial letter of 'not' is 'n'.
'n' going into 'rage' is 'range'.
(Other definitions for range that I've seen before include "Mountain chain", "Take sides", "Limits - scope", "Cooking stove or place for target practice", "Scope; line of mountains", "practise shooting here", "Travel", "Place to practise driving", "Oven" and "Selection".)