Newly rejuvenated, enter with this familiar feeling (4,2)
I believe the answer is:
deja vu
'familiar feeling' is the definition.
(I've seen this before)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for deja vu that I've seen before include "The experience of thinking that a new situation has occurred before" , "Already seen" , "Feeling that one has already experienced something" , "Sense that something has happened before" , "Familiar feeling" .)