Prepare oneself to greet day anew (3,5)
I believe the answer is:
get ready
'prepare oneself' is the definition.
(I've seen this before)
'greet day anew' is the wordplay.
'anew' indicates anagramming the letters.
'greet'+'day'='greetday'
'greetday' is an anagram of 'GET READY'.
'to' acts as a link.
(Other definitions for get ready that I've seen before include "third of three" , "Prepare oneself" .)