Crossword Genius

Ben has been on it, I disclose; has an obsession about it (1,3,2,3,6)

Ross

I believe the answer is:

a bee in his bonnet

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'an obsession about it' is the definition.
I know nothing about this answer so I cannot judge whether it can be defined by this definition.

'ben has been on it i disclose' is the wordplay.
'disclose' is an anagram indicator.
'ben'+'has'+'been'+'on'+'it'+'i'='benhasbeenoniti'
'benhasbeenoniti' anagrammed gives 'A BEE IN HIS BONNET'.

'has' acts as a link.

Can you help me to learn more?

I've seen this clue in the Sydney Morning Herald.
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