A single feature of the weather (7)
I believe the answer is:
element
This could be a double definition.
'a single feature' is the first definition.
'element' can be an answer for 'feature' (I've seen this in another clue). I am not certain of the 'a single' bit.
'of the weather' is the second definition.
(I've seen this before)
Can you help me to learn more?
(Other definitions for element that I've seen before include "Fundamental component" , "Basic substance or feature" , "Eg, one dn" , "Essential factor" , "fire, perhaps, once" .)