Transmission rate of gold in bank draft (4)

I believe the answer is:

baud

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'transmission rate' is the definition.
The definition suggests a singular noun which matches the answer.

'gold in bank draft' is the wordplay.
'gold' becomes 'Au' (Au is the chemical symbol for gold).
'in' means one lot of letters goes inside another.
'bank draft' becomes 'bd' (this might be a standard abbreviation of which I'm unaware).
'au' put inside 'bd' is 'BAUD'.

'of' is the link.

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

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