Cape created, which is a great leap by sweetheart (8)

I believe the answer is:

goodhope

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'cape created which' is the definition.
I don't know anything about this answer so I can't tell whether it can be defined by this definition.

'great leap by sweetheart' is the wordplay.
'great' becomes 'good' (similar in meaning).
'leap' becomes 'hop' (hopping is a kind of leaping).
'by sweetheart' becomes 'e' (the middle letter or heart of 'sweet'. I am not sure about the 'by' bit.).
'good'+'hop'+'e'='GOODHOPE'

'is a' acts as a link.

Can you help me to learn more?

I've seen this clue in The Irish Times.

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