New date not written in series of symbols (7)
I believe the answer is:
notated
'written in series of symbols' is the definition.
I can't judge whether this definition defines the answer.
'new date not' is the wordplay.
'new' indicates an anagram.
'date'+'not'='datenot'
'datenot' anagrammed gives 'NOTATED'.
Can you help me to learn more?
(Other definitions for notated that I've seen before include "Set down in symbols" , "symbolically portrayed" , "Marked" , "wrote music?" , "commented on" .)