Irresponsible broadcast about intelligence (14)

I believe the answer is:

scatterbrained

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'irresponsible' is the definition.
(similar in meaning)

'broadcast about intelligence' is the wordplay.
'broadcast' becomes 'scatter' (broadcast can mean to scatter seeds).
'about intelligence' becomes 'brained' (I can't explain this - if you can you should give a lot more credence to this answer).
'scatter'+'brained'='SCATTERBRAINED'

Can you help me to learn more?

(Other definitions for scatterbrained that I've seen before include "Inattentive" , "Careless" , "Disorganised, lacking concentration" , "easily distracted - with 20d" , "Unfocused" .)

I've seen this clue in The Times.

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