Understanding of current things in variety (7)
I believe the answer is:
insight
'understanding' is the definition.
(insight is a kind of understanding)
'current things in variety' is the wordplay.
'current' becomes 'i' (symbol for electric current).
'in variety' indicates anagramming the letters (I've seen this in other clues).
'things' with letters rearranged gives 'nsight'.
'i'+'nsight'='INSIGHT'
'of' is the link.
(Other definitions for insight that I've seen before include "Intuitive understanding" , "ability to perceive clearly" , "comprehension" , "The ability to perceive the true nature of something" , "Acute understanding" .)