An essential part of parasitism in the current circumstances (2,2,2)

I believe the answer is:
as it is
'an essential part of parasitism in the current circumstances' is the definition.
I can't judge whether this definition defines the answer.
'an essential part of parasitism in' is the wordplay.
'an essential part of' indicates a hidden word.
'AS IT IS' is hidden within 'parasitism in'.
Can you help me to learn more?
(Other definitions for as it is that I've seen before include "Like now" , "Actual state of affairs, often contrary to expectations" , "In the existing circumstances" , "true to life" , "Given the position, in the circumstances" .)