He’s up with what’s new, distributing top titles (4,5)
I believe the answer is:
test pilot
'he's up with what's new' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'distributing top titles' is the wordplay.
'distributing' is an anagram indicator.
'top'+'titles'='toptitles'
'toptitles' is an anagram of 'TEST PILOT'.
Can you help me to learn more?
(Other definitions for test pilot that I've seen before include "One might check bombers" , "Alan Shepard once?" , "one examining details of flight, spin, etc" , "highflying expert" , "Highly dangerous job" .)