Swiss banker's heading off for gold rush city (4)

I believe the answer is:

nome

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'gold rush city' is the definition.
The definition suggests a singular noun which matches the answer.

'swiss banker's heading off' is the wordplay.
'swiss banker' becomes 'gnome' (informal term for a banker, esp. one in Zurich).
'heading off' means to remove the first letter.
'gnome' with its initial letter taken away is 'NOME'.

'for' is the link.

Can you help me to learn more?

(Another definition for nome that I've seen is " Government department".)

I've seen this clue in The Independent.

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