For No. Ten a new PM (9)
I believe the answer is:
afternoon
'pm' is the definition.
(I've seen this before)
'for no ten a new' is the wordplay.
'new' is an anagram indicator.
'for'+'no'+'ten'+'a'='fornotena'
'fornotena' is an anagram of 'AFTERNOON'.
(Other definitions for afternoon that I've seen before include "several hours" , "Between noon and evening" , "No ante for this part of the day" , "Time of day" , "Post-midday" .)