Existence, whichever way you look at it (4)
I believe the answer is:
esse
'existence' is the definition.
(I've seen this before)
'whichever way you look at it' is the wordplay.
'whichever way you look' becomes 'ess' (I can't justify this - if you can you should give a lot more credence to this answer).
'at' is a charade indicator (letters next to each other).
'it' becomes 'e' ('e' can mean 'electronic' which is similar to 'IT').
'ess'+'e'='ESSE'
Can you help me to learn more?
(Other definitions for esse that I've seen before include "Actual existence" , "Sees (anag.)" , "Essential nature (philosophy)" , "Reality" , "Fundamental nature (philosophy)" .)