Stove not initially in fashion (5)
I believe the answer is:
range
'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 "Scope, extent" , "Series of connected mountains" , "Cowboy song 'Home on the . . . . .'" , "Kitchen gadget" , "Variety; wander" .)