Broadcast with intelligence, but he needs to collect his thoughts (12)
I believe the answer is:
scatterbrain
'he needs to collect his thoughts' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'broadcast with intelligence' is the wordplay.
'broadcast' becomes 'scatter' (broadcast can mean to scatter seeds).
'with' is a charade indicator (letters next to each other).
'intelligence' becomes 'brain' (brain is a kind of intelligence).
'scatter'+'brain'='SCATTERBRAIN'
'but' is the link.
Can you help me to learn more?
(Other definitions for scatterbrain that I've seen before include "I'll forget" , "Person incapable of concentration" , "butterfly" , "Dippy type" , "Disorganised thinker" .)