Stormy night is visible (7)
I believe the answer is:
insight
'visible' is the definition.
(something in sight is visible)
'stormy night is' is the wordplay.
'stormy' indicates an anagram (stormy suggests disruption).
'night'+'is'='nightis'
'nightis' anagrammed gives 'INSIGHT'.
(Other definitions for insight that I've seen before include "Clear understanding" , "Imaginative penetration" , "Awareness" , "Perceptiveness" , "Special knowledge" .)