A special triple variable solar phenomenon (7,7)
I believe the answer is:
partial eclipse
'solar phenomenon' is the definition.
The answer and definition can be both related to natural events as well as being singular nouns.
Maybe there's an association between them I don't understand?
'a special triple variable' is the wordplay.
'variable' indicates an anagram (a varied form of the letters).
'a'+'special'+'triple'='aspecialtriple'
'aspecialtriple' is an anagram of 'PARTIAL ECLIPSE'.
Can you help me to learn more?
(Other definitions for partial eclipse that I've seen before include "Sun's incomplete coverage" , "incomplete coverage - > seen as ominous by some" , "blockout without full effect" , "Heavenly event" , "perhaps, of ominous event?" .)