Crossword Genius

Intelligence of supporter on good terms with current head (10)

Ross

I believe the answer is:

braininess

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'intelligence of supporter' is the definition.
The definition suggests a singular noun which matches the answer.

'good terms with current head' is the wordplay.
'good terms' becomes 'brain' (I can't justify this - if you can you should give a lot more credence to this answer).
'with' says to put letters next to each other.
'current' becomes 'I' (symbol for electric current).
'head' becomes 'ness' (ness is a headland).
'brain'+'i'+'ness'='BRAININESS'

'on' is the link.

Can you help me to learn more?

(Another definition for braininess that I've seen is " intelligence needed".)

I've seen this clue in The Times.
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